Naa when it evaporates it's gone, couldn't detect any residue in the cap, just the same as when you have your clothes dry cleaned. Now when we used it in a un-ventilated shop to wash down brake dust if your sticking your nose into it or doing brakes all day long, yea I'm sure I got more exposure but then again we use to use the air hose right? heh
I really only worked with single post lifts and in visiting my friends shops with the new fangle double post or 4 poster I'd be more concerned about having to remember to not turn around and walk into the frigg'in thing. They are nice for working on drive trains I guess, but I never had too much problems with a single post doing even exhausts, really old timers will remember the 2 post axle lifts which I think are cool but even in my days I never came across one. Heck when I was at LA Harley Davidson we had nice little single post in the floor air lift for each mechanic bay (35). You just hook up a air hose tire chuck to bring the square metal pad to the frame, swing the J bolts around the frame rail, tighten the wingnut down and lift it up as high as you want.
Even though I worked in the parts department I had my own service bay as this was during the CHiPs days when they were riding Kawasaki's. 35 bays with lifts in every one. The shop in it's heyday must of been something else.
I have worked in a grease pit too, the old style that are outlawed everywhere now. (1 exit)
