Do your own pest controlSome rat and mouse poisons dehydrate them until they die so if you keep the unit dry of water they will leave looking for water and die somewhere else. Usually it will say in the directions to keep water sources out of the area or something like that. You can buy poison boxes to put the stuff in so dogs and kids can not get to it. They go in and eat the poison then leave the box and the mess inside. You can then clean out the box every now and then and replace the poison. I keep one under my unit near both wheels where they typically enter so the food source is right there.