I had my wheels powdercoated and ran into the powdercoat guy today and he said he forgot to tell me Windex is the best thing to use on powdercoat. Just a tip.
X2 on Windex. I worked at a John Deere dealership for 8-1/2 years, and all of the steel parts on John Deere lawn and garden tractors (fender decks, mower decks, wheels, etc....) are actually powdercoated from the factory, starting in the mid 1990's.... When we would clean the new tractors up for the showroom, we always used Windex.
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Powdercoat cleaning - 
