How do I get rid of black pet stains on hardwood floors?
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Try cleaning it with white vinegar. If that doesn't work, try hydrogen peroxide. The last resort is sanding and refinishing the wood.
Hydrogen peroxide seems to be the 'go-to' solutions, Tammy, but here's a link with a few other options:
https://www.murphyoilsoap.com/hardwood-flooring/how-to-remove-pet-stains