mice... how the heck.

I fought this problem for 3 years trying to figure out where they are coming in. I even crawled under the MH at night and looked for lighted areas underneath, nothing to see. One year I took my cover off of the generator and found a nest under it. They also chewed through wires in the eng compartment. After trapping several a week I bought some steel wool are stuffed every crack I could find especially around the water drain pipes. Then stuffed Walmart bags in to act as a filler and to keep the steel wool tight. This seemed to work the best over moth balls drier sheets, peppermint etc. I still keep several traps with peanut butter just in case they slip trough another area. So far they have not chewed trough the steel wool areas.