Today I was cleaning a house that had yellow vinyl siding and old galvanized storm windows on each window. On the vinyl there was a grey stain which looked as if it were coming from the corner of the galvanized storm windows streaking down the siding. Has anyone ran into this problem before and if so what did you use to remove the stain. By the way I tried oxalic acid after brushing a lot and dwelling on the siding it came off but not quick enough for me.
Today I was cleaning a house that had yellow vinyl siding and old galvanized storm windows on each window. On the vinyl there was a grey stain which looked as if it were coming from the corner of the galvanized storm windows streaking down the siding. Has anyone ran into this problem before and if so what did you use to remove the stain. By the way I tried oxalic acid after brushing a lot and dwelling on the siding it came off but not quick enough for me.
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