I'm quite misunderstood around here, my feelings are hurt. I wasn't talking about harming the old folks, jeez. Chemical warfare, thats where its at. Get a few pints of Beta-mercaptoethanol from a science/chemical supply house. It is one of the most foul smelling things in existence. Added benefit is that it will shut down your sense of smell if you stick around, just not enough to save you from its smell, but you wouldn't smell the weed. It took 1 1/2 weeks for me to get rid of all the tenants of a 4 unit apt. building. Was around 3 months before landlord could rent the units again