One common method used to remove granite stains is by creating a poultice. A poultice should be used as a last resort for stains that cannot be removed by a regular granite cleaner. Since granite is somewhat porous even when sealed, it can stain if spills are not cleaned up in a timely manner. Always try to clean a spill as soon as possible, because the longer the spill is on the granite, marble, or other natural stone surface, the harder it is to pull the stain. Be sure to blot up spills instead of wiping them, as this could spread the liquid over a larger area causing the stain to spread. After any excess liquid has been removed, use a pH balanced granite cleaner that will also condition granite, marble, limestone, and quartz countertops. If a stain is still visible, a poultice may be necessary. Before making a poultice, it is important to determine what has caused the stain because different stains require different chemicals. Since the stain has settled into the granite or marble countertop due to the porous surface, it can be re- absorbed out of the surface in the same way. The poultice absorbs the stain much like a sponge. Generally speaking, a poultice is a chemical-powder mixture with the consistency of peanut butter. It could be made with paper towel, talc, whiting chalk, and certain clays. Depending on the type of stain, you would mix the powder with a chemical such as acetone, ammonia, or mineral spirits. This mixture is placed on top of the stain about 1/4-inch thick and covered with plastic. Tape the plastic to the surface to seal the edges. If you are using paper towel, you would soak it in the chemical and cover the paper towel with plastic and tape the edges. Saran wrap or a sandwich baggy could be used. Poke several small holes in the plastic so that the poultice can thoroughly dry. Through the drying process, the chemical in the poultice pulls the stain out of the top levels of granite. Letting the poultice dry completely is very important, because if it is not left on the stain long enough, it will not work at capacity. Drying could take between 24 and 48 hours. After the poultice has dried, rinse the area with water and go over it with a good granite cleaner. This process can be repeated three to five times if necessary. Remember, though, that harsh and abrasive chemicals should only be used as a last resort because they could potentially damage granite countertops over time. The best way to maintain your investment is by preventing stains and conditioning the natural stone surface with a high quality granite cleaner!
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