New dark/black spots on my hardwood floors

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Q: I’m noticing new dark/black spots on my hardwood floors.

Should I be concerned? What causes this?

A: I can’t even give a comment. Is your floor wax finished or does it have a polyurethane top coat? Do you have pets who are using the floor as your toilet? Are these shoe scuffs? Do you use an appropriate cleaner? You haven’t given me any information, so I don’t know what to say.

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