I had a mouse problem and couldn't figure out how they were getting into the house (upstairs inside the coach).
I had to pull my washer out and noticed that the water lines came through this cabinet and traveled forward to the kitchen. The hole that was cut into the cabinet was huge compared to what was needed and there was nothing to block anything coming through the hole. On the other side of the cabinet toward the aft, was the pedestal that the toilet sits on. So if a rodent could get in the basement and could find the black tank, the could climb up and into the house.
I found and used this product
First off, know that it is slow rising so it may take 3-4 hours to rise, so don't spray like you would a quick rising foam. Don't use it on any vertical space that you can't build it up from the bottom. I sprayed and filled about a 1/4 of the hole and came back later and it had risen almost all the way to fill the hole, so I filled a little more with the stuff. I did not add wool of any kind, just this foam. I foamed the hole on the side that the pipes went forward also. Not one rodent in the house since then, been over a year now.
When I went to the factory last year I paid them to raise the coach up and hunt and foam places that rodents could get in. I see a couple places they tried to foam but they didn't realize how slow it rises, so a lot of it dripped out. They also made a plexiglas filler that fills the open spaces in the slide tubes (I only have 1 slide). So they know how to do this and have used the foam above - they went out to purchase this to use in my coach after I showed them the can I had.
So anyway, use this foam, I think it is so dense a mouse can't smell through it, as shown in the video, so they don't try to get through it. Check in the washer dryer cabinet, and anywhere pipes come up into the house.
Also, I started using bronze wool where my electric cord and water hose enter the bays. I push the cord/hose into the notch out and then add bronze wool (won't rust) to fill any remaining gap so a rodent can't climb the cord/hose and right into the basement.