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We just had a discussion on that the other day. People here are not as bad as other places, but the search function will help a lot on simple questions.
Oxalic acid, a.k.a "wood bleach". I get mine as crystals at Ace Hardware. Put about 1" of warm water in a bucket. Shake some xtals in...swish till they dissolve. Apply to the affected area, wait a couple mins, then rinse with water. Wear heavy gloves and dont breathe the fumes. Also works like magic on the brown hull stains. I belive barkeepers friend is the same ingredient.