Water and roof run off marks
Where water runs off roof and down side window there is always a mark that is hard to get rid of. I bought some glass stove top cleaner which is a mild abrasive and puts a protective "coating" on. Any...
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Even simpler...Mr. Clean Magic Eraser. But first, you gotta clean the roof and wax it to keep the oxidized paint from running down when it rains or from dew or A/C condensation.
