cleaning galvanized aluminum t-top?
I have recently purchased a boat with an after market custom Aluminum T-Top. I have tried to clean it with a bunch of different brands of cleaners but none have taken off the buildup. I am uncertain wether or not it is galvanized but there is no rust. The cleaners I have used thus far are all OK for galvanized products. The buildup is small spots of blackish/grey gunk and simply won't come off. I do not want to sand it as I don't want to ruin the galvanizing if it is indeed galvanized. I have asked the pros how to tell if it is galvanized and I have received a wide variety of very different answers. Any hints, tips or suggestions on what I can do to get rid of all of these samll spots of gunk and how to determine wether it is galvanized or not.
