Bounce dryer sheets seem to work for me. Put one in every cubby, drawer and cupboard. Stuffed one in the the
electrical port and put one in the 3-way
fridge control area behind the outside vent. In two winters, the only evidence of mice damage I've seen is the chewed-through straps that run under the trailer to hold the cover in place.
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Lil M.
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“When one tugs at a single thing in nature, he finds it attached to the rest of the world.” ― John Muir