After my A/C unit was replaced the drain pipe was no longer feeding into the gutter and I ended up with white roof stains. Any advice treating these stains ?
I think CLR might be a good product to use if it won't bother the roofing material. CLR is a cleaner for Calcium Lime and I believe Rust, thus the name CLR. You might do a small area test on the roof before attacking the large stained area.
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