I know some may see it as a myth, and maybe it depends on number of mice or type of rodent, but we have been using bounce sheets in our MH for 3 years now with incredible success. Granted our MH is parked on an RV pad next to our home in a very suburban neighborhood. After the MH's first winter at our house, we came out in the spring to find mice droppings virtually everywhere. In almost ever cupboard, drawer, cushion. I realize it was sitting for a few months, but I guarantee there was more than one occupant during the winter, else we must have left a large supply of fiber in there for that little fella to eat all winter. My wife was disgusted and it took some serious cleaning and scrubbing before she felt comfortable once again.
So the following year she had heard about the Bounce sheets from a good friend of ours that use them at their cabin. I figured the worse case scenario would be the MH would smell nice when I went to dewinterize it. For the last 3 years we have been putting the bounce sheets throughout the MH, usually cut in half and placed in each drawer, cupboard, opening. In those 3 years, we have yet to have another mouse dropping in the MH. I'll admit I thought my wife was NUTS, and I'll deny it if you tell her, but I knew there was NO way to block all the openings where they could get in and it has worked great.
Again, this is only my experience in a suburban area. I'm sure if you are in a rural area where the mouse population is larger or in an area where they are a little more aggressive, this idea may not work for you, but it has for us so I thought I would share.