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Don't use an ordinary kitchen cleaning product to clean granite. The newest technology uses peroxide and detergents to penetrate soiled areas. Simply spray a product such as Bio-OX Citrus Concentrate on the soiled area, allow it to penetrate for a few minutes, then wipe clean. Baking soda can be sprinkled on for a more abrasive cleaning action. Repeat if necessary. Granite can also be cleaned using warm, sudsy water (a mild detergent such as a grease cutting dish detergent or laundry detergent is fine) or a solution of borax and water. Thoroughly rinse and buff dry. To remove stains from granite, make a paste of baking soda and hydrogen peroxide or baking soda and Bio-OX Citrus Concentrate and cover the stain with the paste. Cover the paste with a damp cloth, leave overnight, then wet down and scrub with a nonmetallic scrubbing pad. Rinse thoroughly with clean water. Wipe up any spills as they happen so they don't soak in, and always dry coutertops after washing the dishes.
Tried baking soda and hydrogen peroxide on our new light granite counter top, and it make things much worse. We now have a larger dark stain. thought it might just take time to dry out, but it has been 3 weeks now, and still no bettter.
Try going to your local Ace hardware store and asking for an old school cleaner called Zud. It did wonders for our white marbled pastry board.
Bed Bath and Beyond sells a great granite cleaner in a spray bottle. Works great!