So I go tonight to clean a quarterly martial arts store front. On the bottom of the glass door covering a 20 inch wide by 8 inch high area, it looks like someone splashed acid or something corrosive. This was not there last cleaning. It won’t wipe off or scrape off with a fingernail. I didn’t want to use a razor. It almost looks like HW spotting, as it is white and scaly. There is a pizza place right next door and they have a bad habit of dumping their mop buckets in the area. Any ideas?


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