Ann from San Francisco, Ca writes
Exterminators couldn't get rid of silverfish in condo. They sprayed & then put Niban in outlet plates but the bottle they used had traces of boric acid powder as it was previously used with boric acid. Does that affect Niban? So, if there's already Niban, can I also use Delta Dust? (I found many dead silverfish after using Niban, but after a couple of months I see live ones again.) Where else should I apply Niban or Delta?
We do not recommend applying Delta dust where you are currently using a bait like Niban. Since, you said you used Niban Months ago, we do not see an issue with applying Delta dust in wall voids. You may also want to use Dekko Silverfish packets to treat for Silverfish.
Answer last updated on: 01/26/2014
