Originally Posted by Handyman
We have used only Downey sheets in our campers and boats for over 20 years and have never had a critter or bug problem. Just place them in cabinets, drawers and under the bed and sofas.
We can't use them due to allergies, but they do work.
Might want to stuff a couple down in the underbelly, it's not like you have to drill any holes in the floor. Tie a string to them so you can pull them up in the spring.
There's a whole lot of stuff down there for them little buggers to chew on.