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Oxalic acid might be a quicker fix. It’s the main ingredient in a branded product called bar keeper’s friend, if I remember correctly. Stains could be a result of cast iron reacting with the tannic acid in the wood, if you have cast iron pots and such. You could probably reduce staining by applying a food safe hard wax over the maple, but no doubt you have considered that.
Sharkstar-
Also @Howard, thanks!
Yeah, wax won’t be happening, but I will check out barkeepers friend.
withered_preacher
We periodically get these black stains on our maple countertop and I can’t figure out what’s doing it. Any ideas? I think it must be some kind of reaction to either metal or food, but don’t know for sure. I can get them mostly off with a mix of salt and lemon juice, but I’d rather not get them in the first place.