I did windows the other day and had a hard time removing some kind of residue on the window exterior. The home owner says he has in the past with great difficulty removed the residue with a razor. i tried the razor by wetting the glass then scraping but no good. I tried ajax with a scrunge sponge and it didn't work. I windexed and dried and it was still there. What is this stuff RAIN Minerals? I have no clue. what do I use to restore these windows?
try using some vinegar on the spots, if it is mineral based (as in water spots or even stucco residue) the acidity of the vinegar should help to remove it
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