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Ray K Ray K is offline
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Default How to clean outside of white aluminum gutters

wrote:

It sounds like the stains are oxidized aluminum. Repaint.


Definitely not oxidation. When I tried rubbing alcohol applied with a
paper towel, it made a noticeable improvement, but took a lot of
pressure. Also, that would be expensive to treat 158 feet.

Overall, the first thing I tried (bleach with laundry detergent) made a
noticeable improvement, but not as much as I'm looking for.