Mothballs have always worked for us too. We also open EVERYTHING up so light can get in. Mouses, meese, mice, or whatever you call them don't like light! Open the overhead console, take the cab air filter out and leave that door open, and remove the fuse panel door. Stick mothballs in and around these places and the little bastards will be lookin' for happier homes. Also a good idea to open all the access doors to the separator, open the boots on the elevators etc. Then go out and start the machine up every now and again through the off season and run the separator. That really rocks their world and is good for the engine too. Good luck! Tom langan