I hate mice we had them off and on over the years. We put can lids over any holes, spray foam any cracks 1/4" and larger. After 45 years of trying to keep them out, for the most part they don't get in. We always bait traps with peanut butter, but only a smearing. Otherwise some smart ones are able to get it off without setting off the trap. One cat can get them sometimes but, other two don't care.