Four words: Frank's Red Hot Sauce. "I put that s*** on everything!" I have a garage that's pretty well sealed, so thankfully they haven't gotten into my vehicles, but I was having problems with squirrels (tree rats) getting into my propane BBQ and making a mess of it. I clean it regularly, but it didn't matter; they would still go in and make a big mess. So I dumped some Frank's in there and staked it out, Caddy Shack style. Sure enough, a big ol' squirrel went in for some eats and came out dazed, wiping at his mouth, stumbling back towards his tree. He could barely climb it because he was too busy trying to wipe his mouth out. I was laughing for days, and they haven't been back since! Added bonus: Once you've handled the squirrel problem, you can make buffalo wings!