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Every now and then you come across a pot or a pan with a stain that can't be removed by routinely washing the dishes. These stains take a little time to remove. Stubborn stains can be removed from non-stick cookware by boiling 2 tablespoons of baking soda, 1/2 cup vinegar, and 1 cup of water for ten minutes. Before using the pan again, season it with vegetable oil.
I've known this for years and it works.
Not sure how it works since the soda neutralizes and the vinegar. The ol' acid/base combination.