you’ll never stop them getting in, particularly at this time of years when dark, wet cold outside and agree with above – little nipper wooden traps, only ones that are reliable and get’em, peanut butter or bits of choc chip biscuits as bait. Check morning and evening, you’ll soon know it if you forget, the stink of a rotting mouse is horrendous.
If you want to know about dealing with squirrel, rat, hornet, wasp, moth etc invasions, just ask…..