How to Treat Silverfish
The first thing you need to know about silverfish is that they get into your house from the outside. Therefore, the first thing you need to do is to treat the outside of your home. A link to my video on how to do that is below. Please note that, in the video, I recommend mixing the pesticide 1 part Bifen XTS to 14 parts water in the sprayer cup, but for silverfish, I recommend mixing it 1 to 10. You can also do this treatment with a 20-gallon hose-end sprayer. I also have a link for that video below. With a 20-gallon hose-end sprayer, you can use any pesticide that is registered for silverfish. Just follow label directions for how much pesticide gets mixed with a gallon of water.
The next thing you need to do is treat the inside of your home. Purchase Niban FG Fine Granular Bait. I will give you a link for the product. You can apply this product in cracks and crevices and in areas that are not accessible by people or pets, where you see the silverfish activity. One of the nice features about this product is that it comes with an applicator tip, so that you can apply it without using a duster. Treat under baseboards, appliances, and where plumbing penetrates the wall, like under the sinks, and where the toilet supply pipe goes into the wall. You can also apply the product in basements, attics, and crawl spaces.
In more open areas, you can use Dekko Silverfish Packs. You can place these on kitchen shelves, under sinks, inside drawers, on bookshelves, in pantries, in attics, or any other place you are seeing activity that is out of reach of children and pets. You want to place these about every 12 inches apart on shelves, and place about three or four of them under sinks and under appliances.
Finally, it's a good idea to seal up any cracks and crevices on the outside and the inside of the building. Not only will this help to stop silverfish, but other invading pests as well.
Video on how to treat the outside of your home: https://youtu.be/Yozv3s-Qwlw
Niban FG Fine Granular Bait: https://www.domyown.com/niban-fine-granular-bait-lb-p-49.html?pdpv=2
Dekko silverfish packs: https://www.domyown.com/dekko-silverfish-packs-p-204.html?pdpv=2