If you see creepy silverfish wiggling across your bathroom floor or bathtub (EW!), boil a pot of water and carefully pour it down the bathtub and sink drains. Silverfish love water sources, so dark drains are their favorite hiding places. The boiling water is hotter than what usually comes out of your faucet and should destroy the bulk of those pests who scamper when the light comes on. Sprinkle about a cup of table salt on the bathroom floor and in cracks and crevices (where silverfish usually enter), then vacuum the floor and all the cracks and corners of the bathroom (and any adjacent room, to be safe). The salt will help kill insect eggs and larvae that may get sucked into your bag. Oh, and speaking of your vacuum bag…change it (or empty the canister) immediately after sucking up the salt. Carefully seal the used vacuum bag in a plastic bag, and discard in a receptacle outside your home.
More natural ways to keep pests away…