Moth balls don't work. At all. Watch the videos on youtube from Shawn Woods. Posting again in different mouse thread. Mice don't care about moth balls, or pretty much anything. There are some good kill traps as Bill Anderson has described. What we have found that works 100% is poison bait stations. Put a couple by the wheels. Don't worry friends, we are animal lovers, with many pets. Dogs, Cats, turtles, lizards. Mice can be extremely destructive. Mice are not an endangered species. They reproduce at an amazing rate. Mice are cute, so don't worry, they will survive, but not in our $60,000 fifth wheel.