@ Ice, sorry for late reply. Seems that after you have cleaned the pot, the stain remains. Try denture tablets (those cleaning tablets that old people submerge their whole set of false teeth in water with). Submerge your pot in room temperature water and then put one (two if the stain is really strong) tablet in it. Sit them overnight, wash, and then boil in clean water, and wash again. Any previous seasoning will be wasted, but you maybe able to save the pot.
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