From https://www.swimmingpoolsteve.com/pag... this video talks about stains on steps in vinyl liner pools. These are often acrylic steps or fiberglass steps when installed as "in-wall steps" in a vinyl liner lined swimming pool. These (often white) steps can develop staining over time which can be hard to remove. This video talks about a few different ways that you can try to resolve staining problems using both a pressure washer as well as chemical treatments to remove metals stains.

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