I just visited the Caswell site recommended by Dave Crooks. They had an "anodizing forum" within the site, where I found instructions on anodizing removal: Mix one can crystal Drano with 3 gallons of water, at roughly 65 degrees. water temp is important, it says.Brsh gently with a nylon brush. To confirm removal, use an ohmeter, as the "ano" won't conduct electricity. The same person also said not to use oven cleaner, as this is too agressive and harms the aluminim. I will let you ll know how this works. Thanks for all the replies. Cliff Danley First Coast AMC Jacksonville, Florida