I use moth balls and dryer sheets. For some reason they can't take to smell. I have a car I don't drive in the winter and notice it started smelling like mice. So I put 4 boxes of moth balls in there and the next day I saw a hole in the cover. The little bastards bailed ### out of the car and ate their way through the cover. As a note I have a story. I much as I hate what they do I saw a mouse one day under the hood on another car and I grabbed him. I was going to step on him when I looked in his eyes and connected to him for a sec. They only do what they have to stay out of danger and the elements. I felt bad for him so I just tossed him in a bucket and dropped him of down the road. I know laugh it up.