Here are questions related to Keeping Squirrels Out of an RV.
What is a good way to keep squirrels and other pests out of our motorhome that is parked?
By Norma from Bethlehem, GA
By The Bug Dr03/16/2011
Try Fresh Cab. Works for about 3 months and has no poison. I know it works for rodents I'm not sure if it's labeled for squirrels. Check with the company to make sure.
Close up all openings. However, if you are talking about the engine compartment there is no way to enclose the bottom of the engine. My suggest is to buy a Havahart live trap from the local hardware store, trap the critters and release them about 10 miles away. You won't get rid of them completely, but you can control the population.
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