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ColinTheAmpMan1 · 3rd Jun 2018, 8:37 pm

Citric acid is quite safe (lemon juice), as is acetic acid (vinegar).
Oxalic acid is very good at removing rust stains. But be careful with oxalic acid, it is poisonous. It is present in rhubarb leaves and, to some extent, rhubarb stems, too. It is the reason why rhubarb shouldn't be cooked in aluminium saucepans; it dissolves the aluminium, but it does leave the pan looking beautifully shiny!
Colin.

3rd Jun 2018, 8:37 pm	#8
ColinTheAmpMan1 Octode Join Date: Jan 2012 Location: Wimbledon, London, UK. Posts: 1,465	Re: Correct Fastener ID Citric acid is quite safe (lemon juice), as is acetic acid (vinegar). Oxalic acid is very good at removing rust stains. But be careful with oxalic acid, it is poisonous. It is present in rhubarb leaves and, to some extent, rhubarb stems, too. It is the reason why rhubarb shouldn't be cooked in aluminium saucepans; it dissolves the aluminium, but it does leave the pan looking beautifully shiny! Colin.