How can i stop and repair stains/watermarks in my granite benchtops?

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Granite Countertop Cleaning
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...Good Luck! =)