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I have that blue stain in my bathtub

enter image description here

The stain comes from my plumbing, which probably contains copper that rusted and creates that stain.

I tried to remove it with bleacher but to no avail.

Do you have any ideas on how I can remove copper stains like this one, please?

Thanks

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    You can try vinegar. – ajeh Aug 9 '17 at 14:09
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    hi @ajeh, the test was successful. Please write your comment as an answer, I will accept it. – Andy K Aug 9 '17 at 15:34
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    But the next question is, why are you getting copper stains? I would be worried that something is wrong with water or piping. – ajeh Aug 9 '17 at 20:00
  • @ajeh long story short. My boiler was having massive issues causing over heated water, changed it, change the fausset that was oxydating and now, everything is good. – Andy K Aug 16 at 17:20
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Vinegar should be able to dissolve copper stains. Those stains are commonly copper hydroxocarbonate AKA copper carbonate hydroxide, which easily dissolves into copper acetate.

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There are products sold for your specific issue. Check your local hardware store or home improvement center for CLR (Calcium-Lime-Rust) cleaner. CLR is a specific brand name but there are many formulations of similar products available.

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