I have a 2018 Sprinter 3500 cab chassis with a Thor motor home mounted. I also just had to have a Grand Cherokee main wiring harness replaced due to soy based wire insulation being chewed by mice. So, does Mercedes use any soy (plant based) insulation on their vehicles? I'm already planning to do a peppermint oil treatment as a deterrent. Any other thoughts or recommendations are appreciated. Cats are out due to allergies. Thanks.