This product has been on the market for decades. Works very well on rust and limescale stains. Even like sea jelly on cars or faucets etc it's very strong so be careful using it on porcelain or cheap stainless steel. If you're trying to clear a clogged showerhead, dilute it with water and make sure the showerhead isn't chrome-finish plastic. The first two times I ordered this I received some sort of fake that ate the china out of my bathtub in places. This is way better and actually what I was looking for.
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