I recall Bob Marsh's story of finding a company that sells/repairs aluminum tankers -
oil, gasoline, milk, etc. You know, the really shinny ones you can see yourself in when you're behind thrm on the road.
Evidently, those guys polish aluminum all day long. Come to think of it, those trailers seem to stay shinny, too??
I'll call the air museam in Chino, California and check with them