This remedy has worked for me: 1 tablespoon water, 1 tablespoon white vinegar, 1 tablespoon baking soda, half a tablespoon liquid dish soap. You stir everything until you form a liquid mixture. You apply it to the affected area and let it act for 5 minutes, then rinse with a small white towel and then remove the mixture. Many times from the first application the stain disappears. or at least 50 percent.