Jim, what I used is electronic rodent noise devices. I went to a factory in downtown Seattle that makes fortune cookies and it was the only thing that they used, that worked to keep rodents out of there building. I bought two large ones and have them on in both both ends of my coach. I then went to Lowes, and bought a case of #00 course steel wool. I removed every drawer in the coach and put steel wool in run ways and any nook and cranny that I could find. No more rodents. At home, last week, rodents got into my heat pump of my stick built house. I put #00 course steel wool everywhere leading into heat pump! No more rodents in there since then.