- 1). Wipe up fresh acid on a wood floor quickly. Use a sponge dipped in a small bucket filled with warm, soapy solution to cleanse the surface. Dry the floor after wiping it down so there is no standing water.
- 2). Sand away the finish from the acid affected boards with fine-grit sandpaper. Sand it along the grain of the wood, not in circular movements. For larger areas, consider renting a floor sander.
- 3). Mix a cleansing solution in a large glass or ceramic bowl. Mix 2 cups of warm water with 2 tbsp. of oxalic acid. Pour some of the solution out on the floor and rub it into the stain with a sponge for 2 minutes. Wipe up any standing liquid and let the damp floor dry overnight.
- 4). Examine the stain to see if it is still there. Lightly sand the stain again, and treat with the oxalic acid mixture until there is no longer a recognizable stain.
- 5). Seal the treated floor area with a high quality wood finish to match the rest of the floor. Apply the number of coats recommended by the manufacturer, or until the stained area matches the rest of the floor.
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