For several years I have fought the mice problem. I tried bounce dryer sheets in all the drawers and cupboards, pepper mint oil in tin foil dishes on the floor and moth balls in the storage compartments. Still had mice, no damage but still they came. Two years ago built the ultimate mouse trap I found on U-tube. Take a 5 gallon pail put 3 inches of car antifreeze in it and install a pop can covered in peanut butter across the top supported by a rod thru the top of the pail. You need some lengths of wood to go from the top of the pail to the floor. This works great catch 2 or 3 mice a year and there is no mice droppings any where in the RV. If they come in they go directly to the trap, best design every.