- Fine grade steel wool
- Mineral spirits
- White Vinegar
- Clean rag
- Household bleach
- Bowl or small bucket
- Oxalic Acid
- Baking soda or ammonia
- Stain, this is available in department stores and hardware stores
- Finishing solution, this can be purchased in any hardware or home improvement stores near you.
There should be enough ventilation in the area. Open the windows and use fans for good airflow in the area. Safety first. Always read the safety precautions in every chemical being used.
Now we can go ahead and start the hardwood floor dark stain cleaning procedure
First, rub the dark stained area with steel wool and mineral spirits. Pour some mineral spirits over the fine steel wool and rub the dark stained area. Apply white vinegar over the stain and let it sit for several minutes. Repeat this step if it lightens the spot.
If the above didn’t work, mix bleach with water over 1:1 ratio. Apply it directly on the stain not the surrounding area. If no noticeable improvement happened, add oxalic acid to the stain.
If the stain is gone, neutralize it with ammonia or baking soda. Let it dry then sand it. Make hardwood floor refinishing with wood stain that matches the color of the wood. Coat the wood stain and let it dry.