Turn on a vaccum cleaner and use that hose thing and blow your smoke into it. It will suck it down. You might be able to use that for your car too. When you're done just bring a vaccum cleaner out and use the hose to suck up all the smoke. Then spray air freshener. Or when you're done with your car just leave your windows down for a while. I used to hotbox my car all the time and just left my windows down when I was done and drove around with my windows down so it would blow all the smoke out.