i had the underside of several of my cars steam cleaned on a lift like that. I just have them avoid the body areas, focus on mechanicals mostly. Turns out great. Allows you to also see what undercoating needs a touch up, etc.
For a cleaner, I use simple green aircraft cleaner. Its safe on aluminum and all metals. I use a soft boars hair brush. Really the steam cleaner is for getting caked off crap off the motor if there was oil seepage.
My 89 carrera looked like a new car after getting this done, original cosmoline and all.
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