Haha...they love remote control buttons!
Seriously, make it hard for them to get in. Seal every gap you can find inside and outside.
Take everything out that they can feed on or use to nest. I've had them chew off the fringe on throw pillows and make nests. Take them out.
Dryer sheets and soap do not work. (but they smell good) Like the others have said...they use them for nesting material when they get in. You will find people that swear by them...but its not true. Mice just haven't been in their trailers for other reasons. (less mice, less gaps/better sealing, etc)
I use traps (glue & snaps) inside, just in case they get in. I put them all over and pray...because that's all you can really do!
-2004 Nissan Titan w/Equal-i-zer hitch
-2014 Jayco White Hawk 24 RBS