Crazy… I nornally try with bicarbonate soda. A thick paste with water but not to thin. Soak in for 10 minutes. Rub in fir a while after… if needed repeat.
They are the worst stains to get out. Hope you manage.
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Hm, the bicarb reacted with the oxalic acid and made it green, so we had to go over again with oxalic acid. Jamie's going to try a bleach solution tonight. I really don't want to replace boards. What a pain of a job!