snap traps with peanut butter or glue traps work best. Fresh cab did nothing for me. Don't use bait that kills because they may go off (correction) Will go off and die somewhere were they will not be found and you will have a stink. I think I finally found how they got in. The slide out support square pipe is hollow and after sealing that seems that I had none in the RV this past winter. If necessary, open the basement or covering at the bottom of the rv, put in a light bulb and wait until dark and see all the openings. Then seal them.