We live in a big old house that has lots of pipes & secret holes, scares me to bits, only been here two years & always lived in new houses before, therefore no mice. We found mice in our kitchen about a year after we moved in, hate to think how long they'd been coming in!
We bought some traps that work similar to the old mouse traps, but you don't use any food, they have a smell of cheese, they are white plastic & look like clips.
We only caught one & then we filled in the holes.
Hopefully that'll be the end of them.
We also had squirrels living in the roof when we first moved in, took us weeks to get rid of them blighters & their babies,
they sounded like baby elephants up there!
God I hate vermin.