I hate mice!
So far, we haven't had any, but I go ballistic with prevention when closing up in the fall....some say methods don't work, some say they do. We use bounce sheets all over, moth balls all over and under the camper. Foil to seal up vents, furnace exhaust. Some people use D-con, but I don't want dead mice crawling into walls and stinking up the place.
I will say it takes a day to get rid of moth ball odor, but worth it to me, if it works.