Black spots all over old floors

Q: We recently bought a house built in the 1920’s. We removed the carpet to find that there are black stains all over the hardwood floors. We have sanded the floors and the stains are still there. How can we remove them without knowing what caused them?

A: Most likely these black spots “all over” your floors, are pet stains. It cannot be removed. Your choices are to stain the floors dark to try and camouflage the stains or remove and replace the floor.

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