use hot water first ,soak it real good,then use bleach on the spot.scrub it a little with a brush or broom and let it sit for overnight.the bleach will turn the wood white again so if you had a stain or paint on the wood,you'll have to redo it.
Sand the stain with fine sand paper lightly. use a clean cloth or paint brush dip it in bleach and put on stain. keep doing this till the stain lifts. I had a water stain on a hardwood floor in my motor home and this is what I did.
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