Dryer Sheets
Come across this suggestion several years ago after having mice "move in" during winter storage. Place dryer sheets around inside the trailer- floor, counter, etc. I was told they don't like the smell (your choice on fragrance?), but haven't had to set any traps for awhile now. No droppings, nothing. And, when you open it up to air it out come early spring, it smells good inside!
-Jimmerbobber
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