I've been using Fresh Cab botanical rodent repellent pouches for the last several years, and so far haven't had a mice problem. I sick a few throughout the garage, and especially in the corners where the door comes down. It puts out a scent that mice don't like, so they move on. It's a little pricey, but considering what I have in my 2 Shelby's, especially the all original '69, for me, it's a small price to pay.