Oxalic Acid is a strong acid compound that functions as a bleach and cleanser on porcelain. Once purchased, prepare a brush, a spoon and a small bowl. Pour oxalic acid as much as 2 tablespoons into the bowl and mix with enough water then stir until it dissolves. This solution will feel cold on the skin, but be careful if you have a wound because it will feel sore. We recommend that you wear gloves when working on it.
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