This week is the second time we went to our coach and found mice droppings inside.? A few months ago they got into our lower cabinets and made a mess out of the paper towels.? I caught one the next day in a cheese snap trap.? The coach has been sitting about a month since our last big trip.? I keep it at a storage place under a roof, but open on the end.? The floor is a dark gravel.? Maybe there is some kind of treatment that I can do to the ground?? It's hard to tell where they are getting in, but mice can get into some really small openings.? Any ideas would be appreciated.