I had mice in the PUP and they chewed my canvas up and made some nests. I plugged all of the holes I thought they could have gotten into and bought a product called Cab Fresh (very expensive). I put three bags of it in the camper, one on the floor and one on each bunk bed. The next week I went down to our property and opened up the camper only to find the OTHER side of the canvas chewed and one of the Cab Fresh bags nibbled on. So for what it's worth, that's my experience with Cab Fresh.