Q: My husband and I recently purchased an older home and were hoping to refinish the floors after pulling up the carpet. It is oak flooring. Is there anything that I can use to get the black stains out?
A: I know of no way to get black stains out. Sometimes they sand out but is often impossible to know ahead of time. If it is not a large area, the damaged spot(s) could be replaced with matching flooring and refinished. An alternative is to stain the floors darker to try and hide the spots.
Hiding stains that won’t sand out
Q imported from our old site, Face Lift Floors: I am redoing my hardwoods. They are pretty old. We tore up the old carpet, but there are big brown circles all over the wood floor. I have sanded them three times but the circles are still there. Can you help?
A: Perhaps you can stain the floor to hide the discoloration.
Original / moved link https://faceliftfloors.com/q-and-a/discoloration.php