Wrap the outside of a clean glass jar in masking tape. The tape should cover the entire outside of the jar.
Pour a thin layer of water into the jar and add a bit of bread. These act as bait for the silverfish.
Place the jar in a location where you frequently find silverfish in your home.
Check the jar each day for silverfish. When silverfish inspect the jar for food or water, they discover the bread inside and climb in. They cannot climb up glass surfaces and remain trapped inside the jar.
Add soapy water to the jar to kill any silverfish that you have trapped, or release them outdoors.
Change the bread and water every few days to prevent mold or fungus from growing.