For removing difficult stains on all stone types try the following steps before consulting an expert.
- Identify the stain.
- Clean the area using a stone cleaner with a neutral pH. If this does not help, try a more aggressive cleaner. Keep in mind what types of stones are sensitive to certain chemicals, as stated above.
- Wet your surface with distilled water. This will keep the chemical from drying too fast, allowing it to stay in contact with the stain longer.
- Prepare a poultice. This will be used to absorb the stain out of the stone. An easy poultice to create at home requires mixing one cup of flour and a few tablespoons of liquid dish detergent. Mix the two together until you have the consistency of peanut butter. You can purchase chemical poultices if you prefer.
- *For stains with red wine, replace the detergent with hydrogen peroxide.
- Thickly cover the stain in the poultice you have created and cover with saran wrap and tape the edges down with masking tape (won't create a permanent residue), then let sit overnight.
- After 24 hours, remove the plastic. Let sit uncovered until poultice is dry. This step is important because the drying is what pulls the stain out of the stone. You can then remove the poultice by scraping it off with a razor blade or putty knife. Clean off the residue with water and a neutral cleaner.
- If stain is not completely removed, repeat the process numerous times as long as improvements are being made.
*Granite is more porous than other stones so it will retain moisture longer. If the stain appears to be gone, but the stone is a slightly darker color, give it a week or more to dry before reattempting the poultice method.
For more information you can refer to the book Stain Removal Guide For Stone by Frederick M. Hueston or call a Sinks Online Customer Service Representative at 1.877.340.0800.