1976 20 MA- what to look out for?

[Basketcase]

I recently used Soft Scrub with bleach on a really dirty boat. It was unbelievable how clean it was after. It is an abrasive, so not to be used regularly, but when trying to clean up a boat that dirty, I bet it would work wonders. You'll want to buff it afterwards, but you would probably want to do that anyway. Nice find. Good luck!