Excuse me if not in the right forum. I looked in the commercial forum but didn't get anywhere with my problem. I have a store front that I've cleaned three times using glass gleam4 and ecover, but the window still looks dirty. It's 30 sq ft. I think it's hard water stains. I would like to try winsol crystal clea 550. I've heard it's an acid solution and could burn the window if not use right. I would like to know if anybody has used it before and if it's hard to use.
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