Recently I have been having great success with my stainless steel appliances including my SS BBQ using "Fantastic" as the cleaner and one of those body wash cloths that are plastic to be used as an skin exfoliator.
This is the one I currently use...
I think it will be very expensive to repair the exoskeleton body and panels. It will be hard for body shops to straighten the metal and hide repairs since there is no paint. We may have to live with the equivalent of a stretch mark on skin if a body panel needs to have a section welded in.