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Be careful, Wink is hydrofluoric acid😳

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There are two different Whink formulations, one based on oxalic acid (the safer), and one based on 1% HF (the more aggressive). Oxalic based will only attack rust stains, hydrofluoric based will attack silica minerals. The HF will take care of some issues the oxalic will not, but has a much higher chance of “frosting” the appearance of silica minerals with more than short exposures. Beware the safety issues - please refer to this thread for details!

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