I have a ceramic barrel tile roof that has a galvanized metal drip edge. The metal has black streaks from where the water has drained off the roof. The metal is galvanized. Do you have and suggestions on how to get this clean?
thanks,
Andrew
Its bare, no paint. Ive tried pressure and a spot test with degreaser and it didn't budge. Not sure if it organic or oxidation, but it has a "streak" like pattern. See the photo. Some people on the web mention a mixture of milk and baby powder, but I haven't tried that yet. Thanks for your help.
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