Galvanized metal drip edge

A

adoyle

New member
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
 
It must have reacted with the SH. I believe that is a coating on the metal. Usually contains Zinc. Some acid will turn it black, but I don't know what turns it back. Maybe an alkaline detergent or degreaser. If you have some do a small test.
 
I've tried pressure and a degreaser and it didn't budge. Picture below.

Miami-20131002-00107.jpg
 
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