Dark Spots on Hardwood Floors

How to remove pet urine in a hardwood floor.
Dark Spots on Hardwood Floors. Dark spots on hardwood flooring are commonly the result of some type of liquid that has soaked into the polyurethane finish and top layers of wood. Unlike white water stains residing on the very surface of the hardwood floor, dark stains require more steps and products in order to restore the beauty of the wood....
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