Some of the citrus based cleaners I've tried have been pretty strong. I'd try it on a small spot before getting too carried away with it, depending on how your wood is sealed. When we had our floors refinished, the company recommended a cup of vinegar to a gallon of water and don't soak the floors. Ours are sealed with "Swedish finish" (whatever that is!)
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Sandy Nachlinger, author of BLUEBONNETS FOR ELLY; co-author with Sandra Allen of I.O.U. SEX
http://sandranachlinger.blogspot.com