I installed outdoor fixtures 8 years ago that are rusty and have rust stains on the scraped back. I am looking for a solution to remove its stains without damaging this one.
For remove rust stains on a scraped plaster, several methods are possible. A first pass to the high pressure machine (not too close to the coating to avoid digging) can sometimes overcome these stains. If the spots are superficialthe passage of a coarse sandpaper is usually sufficient to remove them. If the spots are deeper, results can be obtained with St. Mark's laundry, oxalic acid, bleach, hydrochloric acid, Rubigine... All these products to be handled with care, protecting your hands and the eyes. It is likely that halos will persist.
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