Borax, also known as sodium borate, is sold as an all-purpose cleaner and laundry detergent in stores, but it is also commonly used as an effective insect repellent. Sprinkle a little Borax in crawlspaces, under sinks, in wall cracks, behind appliances and inside walls where possible, according to HowToGetRidOfStuff.com. Because Borax is a poison whose fumes can irritate eyes and be harmful if inhaled or ingested, use with caution and keep out of reach of children and pets.
Soapy Water Trap
Because they love moisture, Silverfish are easy to trap, according to EarthEasy.com. Wrap the outside of a glass jar with tape and fill it with an inch or two of soapy water. The tape will provide traction for the silverfish when they climb the jar, but they will be trapped by the slippery glass of the jar's interior once inside and drown in the soapy mixture. If you can determine where they are concentrated, one of these traps could take care of a large number of the pests.
The most effective way to rid your home of silverfish is to eliminate all sources of moisture and food. Fix leaks and use silicone caulk to fill any cracks where moisture and silverfish may be getting in, according to HowToGetRidOfStuff.com. Purchase a dehumidifier or use central or wood-burning heat to keep your home dry. Silverfish like rice and other starches and cereal, so be sure to keep these items sealed tightly in containers. Use a vacuum cleaner attachment to suck up any scattered crumbs that may be on shelves.