At our cabin it seems we get rid of the bats in the upstairs, and then they come back again. We have cleaned up their gauno, and have burned it to take away any smell. We have left cedar chips, moth balls, sealed all visable holes with caulking, used bleach on floors, and they keep coming back after migration. We have also set up bat houses in the bushes around the cabin (never seen a bat in one yet). They seem to be going under our shakes. Is there anything you can recommend?