I bet he did that at night.I think if a self serve carwash owner seen him washing that greasy fan in one of his bays ,he'd have a sh#tfit.About ten years ago I bought a pressure fryer at an auction that was covered in grease,and I stopped off at a local carwash to wash it off not knowing any better(didn't own a pw'er at the time) The owner came running over and went nuts.I didnt think it was such a big deal,when I raced motocross when I was younger we always stopped there to wash off the bikes,many times full if mud.He said they recycle all their water and the grease screws up their filter system(water always smelled bad there,and the place sits closed out of business for the last 6 years).Needless to say it was the last time I tried to clean restaurant equipment at a self serve carwash!