Gee Davy -
We have dealt with this very same problem in several houses.
Solutions we have found are:
1. Get an INDOOR cat. Outdoor cats lose their edge from the spoils of
war - birds, snakes, bugs, frogs, toads, voles, moles, & mice, whereas
indoor cats retain their blood thirst to kill anything that enters
their domain, especially Mickey and his friends.
2. Track the little buggers. If you live where it snows, it's easy.
Just go outside after a snowfall that has aged for a night, and look
for their tiny little feet prints. You may also have some success
with mud prints. This will provide at least a starting point of which
side of the house they are using as a door to your domicile.
3. Focus your attention near the sill-plate. Many times, they can
wedge themselves up under the cladding at this juncture.
4. Don't live like a human; clean up food scraps and keep mouse food
like birdseed out of your house. We had bird food in our basement one
winter, and soon had about 50 mice ... really, 50 mice!
4. Bless the weasel. Coax a weasel family to set up residence next to
yours. They love mice, in the carnivorous sense of the word, and can
fit through small openings to catch them. Fortunately, a weasel
showed up and occasionally made house calls to remove about 40 of
those 50 mice we had.
5. Invite Farley Mowat over for some boiled mice and beer.
Good luck, and good eatin'
- Bob Stanley, Handy Man