Hardwood Flooring - clean? refinish?

Windgate9

Currently in the middle of a bathroom remodel. The door floor threshold is a transition from hardwood to tile. The second piece of hardwood is original (see photos). It is stained or scratched, not sure. I tried a hard cleaning with soap and a toothbrush - helped a little but no luck. Any ideas how to clean better? Does it need to be sanded and refinished? I really don't want to remove/replace the hardwood pieces and all adjacent trim.

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joecaption

If you use a marble threshold most of that would be covered up.

JazMan

How do you plan to finish the tile? A marble threshold would be the best way, but you'd want to remove the one piece of wood and replace it with ply, then add your concrete backer or membrane.

Jaz

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