Demon WP Insecticide

$8.81 - $95.52

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4.5 out of 5 stars Rating: 4.7

722 Reviews | 309 Q&A



{ $8.81 { $7.95 $95.52
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Demon WP Insecticide envelope(s) (4 x 0.3 oz)

Buy 1: $8.81 each

Buy 2 or more: $7.95 each

Demon WP Insecticide - Box (12 envelopes)Demon WP Insecticide - Box (12 envelopes) case (12 envelopes)

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For large order quotes, please call us at 1-866-581-7378.

Demon WP Insecticide

Demon WP is an excellent professional insecticide that's perfect for crack and crevice and/or spot applications for residual and contact control of Ants, Carpenter Ants, Cockroaches, Crickets, Spiders and many other insect pests. Demon WP can be purchased as either an envelope of four water-soluble packets (shown here) or a Demon WP 1 lb. jar (equal to 12 envelopes of Demon) with a scooper for easily making up to 48  gallons of solution. Demon should be applied with a sprayer.

The 1 pound jar size of Demon WP has been discontinued and is no longer being made by Syngenta.

Active Ingredient: Cypermethrin - 40%
Target pests: Ants, Carpenter Ants, Cockroaches, Crickets, Spiders and others
* See label for complete list
For use in: Commercial and Residential, on and around Buildings, Lawns, Trees and Shrubs for Athletic Fields, Industrial Buildings, Parks and Recreational areas and others
* See label for complete list
Application: 1 packet per gallon of water (for 0.1% active ingredient)
2 packets per gallon of water (for 0.2% active ingredient)
* See label for complete application instructions
Yield: 1 envelope contains 4 water-soluble packets and makes 2-4 gallons of solution
Formulation: Professional Product
Group 3 Insecticide
Special Features: Demon WP leaves a white powdery film that is especially noticeable on dark surfaces
Manufactured By: Syngenta

How Demon WP Insecticide Works

Demon WP is a residual insecticide concentrate with the active ingredient Cypermethrin. Cypermethrin is in the synthetic pyrethroid class of insecticides. It is a man-made active ingredient that attacks the central nervous system of insects that come in contact with or ingest it. Demon WP is diluted with water and applied with a gallon pump sprayer. After it dries, Demon WP continues to work for up to 3 months.

Demon WP Target Pests

A variety of crawling and flying pests including (but not limited to) ants, boxelder bugs, cockroaches, crickets, earwigs, scorpions, spiders, and wasps

PESTS CONTROLLED WITH THIS PRODUCT: Ants, Aphids, Assassin Bugs, Bees, Boxelder Bugs, California Oakworm, Carpenter Ants, Carpenter Bees, Centipedes, Chiggers, Chinch Bugs, Cluster Flies, Cockroaches, Crickets, Earwigs, Elm Leaf Beetle, Fire Ants (Mounds), Firebrats, Fleas, Flies, Millipedes, Mites, Mosquitoes, Pillbugs, Scorpions, Silverfish, Sod Webworms, Sowbugs, Spiders, Termites (above ground only), Ticks, Wasps

Target Uses of Demon WP

Demon WP (Water-soluble Packets) Insecticide is for crack and crevice and/or spot applications for residual and contact control of Ants, Carpenter Ants, Cockroaches, Crickets, Spiders and certain other insect pests. The Demon WP water-soluble packets make mixing and use very easy when used with a 1 gallon compressed air sprayer. (See our selection of sprayers in our Sprayers section).

Demon WP (Wettable Powder) is excellent for larger, tougher pests such as cockroaches, spiders, scorpions, or stink bugs because there is a high concentration of active ingredient. Demon WP is labeled for a wide variety of pests, however, making it an extremely popular general use insecticide for perimeter treatments outdoors or crack and crevice treatments indoors.

The wettable powder formulation also makes Demon WP ideal for porous surfaces such as concrete since the individual particles of active ingredient are larger and can more easily stay on top of the surface.

Demon WP leaves a white powdery film that may be visible on darker surfaces. For applications where this is a concern, consider using a liquid concentrate instead.

Demon WP Insecticide Application Instructions

Each foil envelope of Demon WP Insecticide in Water-Soluble Packets contains four water-soluble packets of Demon wettable powder (WP). The foil envelope must be opened for use. Because water-soluble packets readily dissolve in the presence of moisture, do not allow them to get wet before adding to the applicator tank.

Wear dry gloves when handling the water-soluble packets. Handle with care because excessive handling may cause rupture of the water-soluble packet. Unused water-soluble packets should be stored in the original foil envelope, folded over to minimize exposure to moisture.

Demon WP Insecticide in Water-Soluble Packets are intended for dilution with water for applications. For best results, dilution should be achieved if the following steps are taken:

  1. Fill applicator tank 1/2 with water.
  2. Add desired Demon WP Insecticide in Water-Soluble Packet(s).
  3. Allow 1-2 minutes for dissolution of water-soluble packet(s).
  4. Agitate, stir or shake applicator tank.
  5. Finish filling applicator tank and agitate again before use to ensure satisfactory suspension.


  • Upon standing without agitation for more than 1 hr., the applicator tank should be agitated, stirred or shaken again to achieve satisfactory suspension.
  • Make up only amount of application volume as required.
  • This product should not be applied with oil.

Tank Mixing

Demon WP in Water-Soluble Packets may be tank mixed with other currently registered pesticides unless expressly prohibited by the product label. A small volume mixing test with the other products is recommended to ensure compatibility. Observe all restrictions and precautions which appear on the labels of these products.

* Repeat treatments as necessary, but not more than once every 7 days.

Always read the product label completely before use.

1 envelope contains 4 water-soluble packets and makes 2-4 gallons of finished solution.

Standard Application Dilution rates / Mixing Ratios for Demon WP:

* 1 packet or 1 scoop (0.33 oz.)/gal. of water – 0.1% – maintenance, more frequent applications, foliar applications

* 2 packets or 2 scoops (0.66 oz.)/gal. of water – 0.2% -- clean-out, severe infestations, exterior applications which receive greater direct sunlight, scorpions

* For Perimeter Barrier Applications around Structures – Mix 1-2 scoops of Demon WP in 1-5 gallons of water to cover 800-1600 square feet. Higher volumes may be needed for dense vegetation or landscaping materials.

* 1 scoop is the equivalent of 0.33 oz., 9.5 gm., or 2 level tablespoons

Demon WP is for use in the following areas:

Demon WP is for crack and crevice or spot treatment for residual and contact pest control in, on and around buildings and structures and their immediate surroundings and on modes of transport. Permitted areas of use include, but are not limited to, industrial buildings, houses, apartment buildings, laboratories, buses, greenhouses and the nonfood/feed areas of stores, warehouses, vessels, railcars, trucks, trailers, aircraft (cargo and noncabin areas only), schools, nursing homes, hospitals (non-patient areas), restaurants, hotels and motels, and food manufacturing, processing and servicing establishments, food granaries, food grain mills, and pet kennels. Demon WP is also for use on lawns, ornamental trees and shrubs around residential, institutional, public, commercial, agricultural and industrial buildings, and parks, recreational areas and athletic fields.

Demon WP Authorized by the USDA for use in inedible product areas in Federally inspected meat, poultry and egg processing plants.


See above for complete mixing instructions.

Cockroaches, Spiders, Crickets, Scorpions, Silverfish, Ticks and Firebrats
Apply as a coarse, low pressure treatment to areas where these pests hide, such as baseboards, corners, storage areas, closets, around water pipes, doors and windows, attics and eaves, cabinets, sinks, furnaces, stoves, behind and under refrigerators, the underside of shelves, drawers and similar areas. Pay particular attention to cracks and crevices; also see Outdoor Surface Use on the product label.

Apply Demon WP to any trails, around doors and windows and similar areas where ants (including carpenter ants) may be found. Apply perimeter barrier treatments to prevent infestation as described below; also see Outdoor Surface Use on the product label.

Bees, Carpenter Bees and Wasps
Thoroughly treat nest and entrance, surfaces and surrounding areas with Demon WP where these insects alight; also see Outdoor Surface Use on the product label.

Assassin Bugs, Boxelder Bugs, Sowbugs, Pillbugs, Millipedes, Elm Leaf Beetle and Centipedes
Apply around doors and windows and similar areas where these, or similar perimeter pests, may be found or where they may enter premises. Apply to baseboards, storage areas, and other locations.


See above for complete mixing instructions.

For Perimeter Barrier Treatments

To help prevent infestation of buildings, apply to a band of soil and vegetation 6-10 ft. wide around and adjacent to the building. Also, treat the building foundation to a height of 2-3 ft. where pests are active and may find entrance. Apply as a coarse spray treatment to thoroughly and uniformly wet the foundation and/or band area, using 1-5 gals. of treatment solution applied to 800-1600 sq. ft.

Outdoor Surfaces

Apply with either hand-held or power application equipment as a residual spray to surfaces of buildings, porches, screens, window frames, eaves, patios, lawns, refuse dumps, garages and other similar areas where these pests are found. Also, may be used as a spot treatment in applications to lawns in landscaped areas in and around residential, commercial, institutional and industrial buildings, and similar areas where these insect pests are active.

Fire Ants (Mounds)

For individual fire ant mounds, apply Demon WP as a drench. Gently sprinkle a total of one gallon over the surface of mounds up to 12 inches in diameter. Use 2 gallons for larger mounds. Thoroughly wet mound and surrounding area. Treat new mounds as they appear. Pressurized sprays may disturb the ants and cause migration. If possible, applications should be made on warm days after recent rainfall. All colonies in the vicinity should be treated, including those that have not yet constructed a mound.


Treat and remove accumulations of lumber, firewood and other materials that serve as harborage sites. Apply as a coarse spray treatment to the point of drip.

* Demon WP is not appropriate for applications using a hose-end sprayer.

* See product label for complete outdoor application instructions.

Demon WP Insecticide Features

  • Water-soluble packets are convenient and simple to use.
  • Pet safe after dry, when used as directed.

Extra Tips

  • Some settling may occur after tank mixing Demon WP. Be sure to agitate the tank after resting, and only mix the amount of product you intend to use within 24 hours.
  • Store concentrate out of direct sunlight and extreme temperatures for maximum shelf life of 3+ years.
  • Not labeled for use on edible plants.
  • Exposure to direct sunlight will break down residual more quickly, so applications may need to be made more frequently in these areas.
  • Repeat treatments as necessary, but not more than once every 7 days.
  • Demon WP is not suitable as a space spray with equipment such as misters, foggers, or aerosol equipment. The product will clog or damage the equipment and is not labeled for this use.

Rating Snapshot

5 stars   615
4 stars   66
3 stars   15
2 stars   10
1 star   16

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Average Customer Rating
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Most Helpful Customer Reviews
  • 269 of 292 people found this review helpful:

    5 of 5 stars  Phenomenal Product
    By Matt in Burnsville, North Carolina on 06/02/2009
    Verified Purchase

    Excellent product. I have been using Demon WP Insecticide for MANY years mostly for exterior barrier treatment and in and around garages. I was very impressed. I will never forget the first time I used this product. I sprayed a heavy line in front of our 3 car garage which was getting bombarded by all kinds of crawling insects. It created about a 10-12" line on a hot & sunny day and it dried very quickly. I did it a second time thinking it evaporated, again it dried within a few mins. Came home from work the next day and a solid line of dead bugs exactly where I sprayed. Was as if it was an invisible electric fence. At this point I was sold on this and nothing else. I have continued to use it for years without fail. I found it lasts quite a while but depends on how much direct rain the treated surface area gets. Recommend 100% 

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  • 252 of 262 people found this review helpful:

    5 of 5 stars  Awesome
    By George on 03/22/2009

    "It just works" says it all. I have been using Demon WP Insecticide for 10 years. Forget what you read about multiple applications per year. Maybe outside, but inside, unless you wash or vacuum it away, it lasts forever. I haven't used it in 2 years indoors and it's still killing. I thought, after two years, though, another application couldn't hurt. The first time you use it, when you wake up the next morning, you will be in awe of the dead insects in your house. Just do every base board, even in cabinets and closets and every threshold into your house, garage, carport, etc...threshold exteriors need to be repeated if exposed to the elements. This stuff is the last word in pest control. Don't waste your money on supermarket and building supply store junk and pest control companies that come out and use this same stuff, and bill you $250.

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  • 186 of 201 people found this review helpful:

    5 of 5 stars  This stuff is awesome!
    By Kevin on 08/28/2007

    I have 2 large dogs in my house. Had fleas really bad. I tried every type of bug bomb- Home Depot, Lowes, and Walmart had and it seemed like they multiplied. My parents turned me on to this product Demon WP. I sprayed my baseboards, windows, doors, weep holes in the brick, the entire perimeter of the house, the soffit on the house, and the perimeter of my yard. After all that, I still had 2 pouches left, so I went ahead and sprayed my lawn. I have not seen another live bug in the house for 2 years. I may not have applied it the way I'm supposed to, but this stuff is awesome. Highly recommended.

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  • 139 of 146 people found this review helpful:

    5 of 5 stars  Try it and you will be satisfied!
    By Chris on 02/21/2006

    I have used Demon WP and I know it works . If you have a roach problem in your home this will kill them and will keep killing for months . It goes on wet and dries to a powder . You will be seeing dead roaches in 24 hours and 1 application will last months of killing power . It is safe too, I have pets and a small child and have never smelled or had a problem like pest control services cause . Try it and you will be satisfied.

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  • 115 of 132 people found this review helpful:

    5 of 5 stars  Try this product!
    By Joyce on 07/06/2008
    Verified Purchase

    Great product!!  I've been using this product for 2 years and living by the ocean, we have our fair share of palmetto bugs, roaches and every crawly bug known to man. Demon WP keeps the house insect-free and considering I have a bug phobia, this means a great deal knowing that there aren't any unwelcome pests crawling around our home. Anyone having a problem with bugs should try this'll be glad you did!!

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Most Recent Customer Reviews
  • 1 of 5 stars  Demon wp strikes out
    By D in Big spring, texas on 04/20/2016

    Highly disappointed in product. Used concentrated with poor results. The product was ineffectual against roaches. Maybe I got a bad batch but hoped by the reviews that it would at least kill some of them.I followed the instructions fully but after ten days have only seen three dead roaches. I would not recccomend this product. If the batches are sold in different strengths for different states this batch was a dud.

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  • 5 of 5 stars  Wasp beware!
    By Vincent in Seagrove, NC on 04/16/2016

    This is my go to wasp Med! It gets them every time! And they come back and land where I sprayed and they're goners too! Great stuff and I put 1 oz of Suspend with it and they don't come back they wont even nest in the area that I sprayed last year! And it kills just about every thing else too

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  • 5 of 5 stars  Demon WP Insecticide Box (12 envelopes)
    By Susan in Shellman, GA on 04/10/2016

    This product is the only thing that controls fire ants in south Georgia. We have tried many products, but this one works! Received it promptly! Thank you for your service.

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  • 5 of 5 stars  Best stuff
    By Bsclement in FORT WORTH tx on 03/31/2016

    Moved into a new house that had roaches, sprayed demon wp, work like a charm best stuff ever!!!

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  • 5 of 5 stars  Demon WP
    By Ernest in Lawrenceville, GA on 03/28/2016

    I have used this product to control spiders for years. It is the only product I have found that will fight spiders for a few months. Most products have to touch the spiders when sprayed, but not this one. Great product.

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  • 5 of 5 stars  best stuff ever
    By Harry in Spring Hill FL 34609 on 03/16/2016

    i've been using WP for years, selling our house the pest inspector said he couldn't find a bug anywhere inside or out said he never wrote a report like this ever before i recommend WP for everyone. great stuff inside and out.

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  • 5 of 5 stars   Demon WP Insecticide
    By Ralph in Sanford, Florida on 03/14/2016

    Awesome insecticide. I have been purchasing this product from Do My Own Pest Control for years and have always been very satisfied with the results. I highly recommend it if you are serious about terminating those nasty insects.

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  • 5 of 5 stars  Fast and easy
    By W. in Weatherford, TX 76087 on 03/02/2016

    Ordering this bug killer was easy and it got here very fast.

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  • 5 of 5 stars  Demon WP insecticide
    By Connie in Springdale, Ar. on 02/28/2016

    I've only used one application so far alone with Maxforce FC Magnum & Gentrol IGR concentrate and I hardly see any roaches after 3 and a half weeks and we had like three different kinds of roaches German ,Brown banded, and another I think. We have fought them for years. We moved last August and tried to make sure and not bring any roaches was real thorough. Had Pest control come out about once to twice a month for 2 yrs before we moved. Never knew when they would show up! They did not spay thoroughly. Never ask me to move things away from the wall ect. It would kill some but but never really make much of a difference. For the first time in years I can see living roach free!! These products work and it's not hard to do t all. I'm going to apply a second round shortly. I'm sure that will be all I need. Thank You for your products. This stuff works Great!

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  demon wp insecticide
    By Martha in new albany indiana on 02/24/2016

    I use demon wp insectide around my house and garage every three months . I never see any bugs in my house.

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Most Helpful Q&A's

05/16/2010 Tim

QIs Demon WP children safe when sprayed inside the home?

ADemon WP is safe to use around children and pets when mixed and used correctly.  With most professional products such as Demon WP, once you mix it with water it is only strong enough to kill small insects.  You should always keep children and pets away from where you are treating.  Once the product has time to dry which usually only takes 30 minutes, it is safe for children and pets to re-enter the room.  Of course you should always keep any pesticide or cleaning product out of reach of children. 

98 of 110 people found this answer helpful.
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07/17/2010 Diane

QIf you don't use the Demon WP mixed with water, will it still be good to use later?

ADo not mix Demon WP until you are ready to use it and never mix more than you can use at one time. Demon WP should be used within 24 hours after being mixed with water.

79 of 89 people found this answer helpful.
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03/11/2010 Jim

QCan Demon WP be sprayed on the outside of a home and still be effective?


Demon WP is labeled for both indoor and outdoor use. Apply Demon WP to exterior door frames, window frames, places where utilities (cables pipes and wires) enter into the structure, eaves, soffits, around the bottom of the foundation and out onto the ground several feet. If you have an existing insect infestation, you may also need to spray indoors around the door frames, window frames, places where utilities (cables, pipes and wires) enter into the structure and around the baseboards. Demon WP will last for about 4 weeks outdoors and about 12 weeks indoors.

66 of 75 people found this answer helpful.
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08/01/2009 Jim

QHow toxic is Demon WP to fish and dogs?
How toxic is Demon WP to fish and dogs? I have a pond with catfish approx. 50 yards from my house and during hard rains water runs off form the house area into the pond. I'm having a big problem with scorpions.

ADemon WP is not a problem to use around pets as long as you apply it according to the product label. Once Demon WP is mixed with water, it is only strong enough to kill small insects. You would not want to leave the jar of Demon WP open where dogs could get into a large quantity of it. It is always a good idea to keep pets and children out of the area while you are treating. Once the product dries, usually after 30 minutes, it is perfectly fine to allow pets and children back in the area. However, all pesticides are very dangerous to fish and aquatic life. You would not want to use Demon WP or any other pesticide near a body of water. 50 yards away is a good distance, but if the land sloped down towards the pond, then there may be a concern. If it does not, it should not be a problem to treat around your home that is 50 yards away from the pond.

34 of 35 people found this answer helpful.
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04/29/2010 Rachel

QWhat size house will one foil package of Demon WP do and how often should it be sprayed?

AEach Demon WP envelope comes with 4 water soluble packets, enough to make up to 4 gallons of diluted solution. Most homeowners use 1 gallon of diluted solution or less indoors and about 2 gallons outdoors per application . Depending on the insect you are trying to eliminate, you can spray once every 1-3 months. Please read the Demon WP product label to learn specific usage rates for the insect you are trying to eliminate.

31 of 33 people found this answer helpful.
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Most Recent Customer Questions

03/28/2016 Ray from Hudson, Florida

QLooking to kill palmetto bugs and other insects inside and outside my house in Florida, help !
I am looking for a product(s) I can use inside my house and outside my house in florida to kill pests like roaches (big like waterbugs) and very small fly like bugs inside my house. also looking for a good product I can use around the peimeter of the house, in the grass to stop those vamits from running inside everytime I open a door or window


Demon WP Insecticide will create a barrier of treatment around and inside your home to treat and prevent Palmetto Bugs. Be sure to spray eaves, soffits, window frames, door frames, areas where cables, pipes or wires enter into the structure and any other crack, crevice or gap where insects can harbor.

3 of 3 people found this answer helpful.
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01/30/2016 Jennifer from Kissimmee, Fl

QCan I use Demon WP alongside Invict Gold Cockroach Bait Gel?


You can use Demon WP Insecticide and Invict Gold or another cockroach bait gel in the same treatment rooms, however you want to avoid spraying on top of bait placements or in areas where you are going to place baits. Your general rule is to SPRAY LOW and BAIT HIGH. To mix the Demon WP, you should use 1-2 packets per gallon of water, so if you were to use less water, you should still use at least 1/2 gallon of water for 1 packet. You could also choose a ready-to-use product instead of a concentrate so that you do not have to worry about mixing correctly. We sell a new product called Dos Flea and Crawling Insect Spray which contains both an insecticide and an IGR for control of roaches and other listed insects. Please see our Roach Treatment Guide for more tips and information.

1 of 1 people found this answer helpful.
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01/24/2016 Sue from Birmingham, Al

QWill Demon WP kill small rodents if sprayed directly on them or in their face?


Demon WP is only labeled to be used as a crack and crevice treatment indoors and as a perimeter spray outdoors. Spraying rodents as you mentioned with Demon WP is off label, therefore we cannot advise the product being used in such a way.

We have many products that work great for rodent control such as glue boards, snap traps, rodenticides and bait stations. Please refer to our Rodent Control Page for the best products to eradicate rodents. If you have any additional questions, you may contact a representative at 1-866-581-7378 Mon - Fri 9am-5pm EST.

1 of 1 people found this answer helpful.
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01/17/2016 Dr. from Richardson, Tx

QDo I put the Demon WP packet in the sprayer and then add water?
Do the plastic packets dissolve without opening them?


Yes, Demon WP packets will dissolve when mixed with water in a hand pump sprayer and applied to cracks and crevices listed on the product label. It would help to fill the spray tank 1/2 with water and dissolve a packet of Demon WP and add another 1/2 gallon of water.

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01/16/2016 Dale from Midway, Tx

QDoes Demon WP kill bedbugs?


Demon WP is not labeled to treat for bed bugs, therefore we cannot recommend using it.  What we do recommend is our Bed Bug Kits.  They have a very high success rate and have all of the same professional products that a company would use if you hired one.  Our kits also come with full instructions on how to apply the products in the kit. Please take a few moments to review our article on How to Get Rid of Bedbugs.

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12/27/2015 Alison from New York, Ny

QWhat should I use to clean Demon WP off of surfaces effectively?
My husband got some of the wettable powder in the bathtub and I have children.


Demon WP can be removed using soap and water from the tub or any bathroom cleaner.

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12/18/2015 Tommy from Como, Ms

QCan Demon WP Insecticide be used any time of year outdoors, or is it best to wait until you see pests?
Also, will it work on lady bugs?


You are able to apply Demon WP any time of year when you see activity or as a preventative treatment as long as the temperature is not at or below freezing when you are treating. Lady bugs are not specifically listed on the label, but Demon WP does treat for very common insects around the structure including spiders, cockroaches, boxelder bugs, fleas, and ants.

1 of 1 people found this answer helpful.
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12/14/2015 Irving from Houston, Tx

QDoes Demon WP kill bed bugs?


Demon WP is not labeled for bedbugs. We recommend that you read our How to Get Rid of Bed Bugs guide for a better understanding of what needs to be done and what products are needed to be able to get rid of these pests.

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12/05/2015 Felicia from Los Angeles, Ca

QCan you buy Demon WP in CA?


Demon WP can be shipped to California. We are unsure if there are local distributors that carry the product, but we do always offer Fast Free Shipping.

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11/22/2015 Dsmiddy from Killeen

QIs it possible for Demon WP to make you sick when applying inside my home?


When using insecticides, it is important that you use proper precautions, such as a respirator mask. Demon WP is a chemical and has the potential to be dangerous if the label is not followed properly. We would recommend contacting the manufacturer and/or Poison Control immediately if you feel as if something is not right.

1 of 3 people found this answer helpful.
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Demon WP Insecticide
Demon WP Insecticide
4.5 out of 5 stars | 309 Questions