The ones that made it into my house were coming up along the plumbing of the dishwasher. Also along the electrical outlet under the sink. Found the previous owners (spell that m-o-r-o-n-s) had packed the gaps around the conduit with steel wool. It was all fried and arc-y. Amazing the house didn't burn down. Anyway, we had some electricians make some faceplates to seal the gaps and also closed off the wee spaces around the pipes with sealant. In the garage we had to use sealant where the pipes for the hot water heater and boiler enter the house as they were getting into the walls that way.