Ditto X10 stay out of the MH. Do not attempt to clean this up yourself.
Best bet is to call a pest control company. They will be able to clean your MH up correctly. And check the wiring on your engine.
In the future, buy Just One Bite from a farm store like tractor supply.
I parked my MH in my own driveway for years and the ONLY time I had mice was when the farmer next to me changed out his acres around my house from Alfalfa to corn.
Check your Generator also. The mice stored corn in my gen jamming up the carb and fuel filter. I didn't find that out until I was on the road.....$450.00 in service calls to figure that out. :(