XTPuller, I hear your concern. I bought a 94 R62 with the same situation and havent found anyone with an answer as of yet either. I do know one thing for sure though, DONT use aluminum acidizer on it. There was an R70 on ebay that look like a trick machine but the guy wanted to clean it and used the acidizer and it totally screwed up the galvanize. Maybe someday we will figure out how to make these older machines that sat outdoors shine again. I really wish I could figure this one out also. If you get an answer make sure you leave it on the boards for all of us trying to figure it out.