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Phosphoric acid will remove iron stains. Vinegar may also work. You need to keep the surface wet with the acid for it to have long enough to work. CLR also works. Wear rubber gloves and eye protection if you use phosphoric acid. Phosphoric acid is sometimes available at pool supply companies. Pool supply companies may have other suggestions. Janitorial and restaurant supply stores also will have some good cleaners for iron stains.

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Q: How do you remove iron stains on rocks in a waterfall?
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