Simple answer O3. Ozone. http://cgi.ebay.com/C-A-P-OZN-1-Comm...QQcmdZViewItem You need something like that on your exhaust from yer cab. If you look at the pic of the generator, you'll see a little black hole. You can put a piece of 1/2 inch pvc out of that and introduce that into youe exhaust air. You'll want to do that as early in the exhaust tube as possible so the O3 has a chance to mix into the smelly air to precipitate the odor and render it not-smelly. I always watch the evidence room auctions and never ever see on ozone generator on it. That leads me to believe that they must work. Use one of these and keep your mouth quiet and you'll probably never have a problem from outside "visitors" to your garden.