So I had this bug problem, including wasps and mud-dobbers. I went and bought 3 large dog flea collars and cut them into 3-4 inch hunks and placed them in any orifice that was open to the critters; fridge, heater, water heater, etc. Then I taped a few underneath my AS around anywhere it looked like a critter could get in. Again, under the sink, under my Classic couch, under the bed, wherever. Guess what, no more bugs, no more wasps, no more spiders. I figure the flea collars will last about 7-8 months, maybe more. Cheap protection at double the cost. Hope you try it.
2008 F-250 4X4 Lariat V-10
2002 Airstream Classic 30' w/SO #2074
2007 Kubota 900 RTV
1996 Ford Bronco
2007 Lincoln LT