What I have used for years is Coyote urine. It can be purchased online and using a spray bottle I spray it on the tire base, the levelers, and the power cord. This keeps squirrels, rats, mice and other small rodents away from the coach. Depending on the weather/rain, a spray usually lasts about a month.
I don't worry about things on the inside since I stop the pests on the outside.
And no, it is not an offensive odor to humans and my big dog just took one smell and basically ignored it from then on. Of course she is much bigger than any coyote. :B
