Mice, Rats, Beavers, Marmots. Snakes, Cats. Rant / Questions

I have heard of people using mothballs in a car then having a heck of a time getting the smell of the moth balls out of the car. Heard once of an aviation product that you spary around the wheels and the mice will not cross it, can't remember what the name was, but being as it was an aviation product I'm sure it wasn't cheap, and then it would have to be renewed every so often.