Rodent-Proofing Your Camper Van: Best Methods to Keep Mice & Rats Out 1. Use Electronic Rodent Repellents Electronic rodent deterrents use ultrasonic sound waves that are unpleasant for rodents but undetectable to humans and pets. ✅ Best Options: Plug-in or battery-operated ultrasonic repellents.✅ Where to Place Them: Inside your van and near any known entry... Continue Reading →