Sealer prices vary from brand to brand and are easy to apply yourself without bringing in the professionals to do it for you. If you get quality products rather than just looking at the prices, you may save money in the long run. To clean your granite, use warm water and mild detergent daily then use proper granite cleaner once a week. We, at Interstone Marble and Granite, recommend and sell Fila brand stone cleaners, enhancers, and sealers here at Interstone. To clean your granite, never use those common kitchen cleaners and especially not vinegar and water. Acidic liquids like vinegar and vinaigrettes, juices such as tomato, lemon, lime, and orange will etch the stone so pick up any mess as it happens, to protect your investment.