When purchasing granite countertops, most granite dealers use a sealer that never has to be resealed as there normal sealing process. It no longer applies to a particular granite slab or color as it did when this sealing process first came on the market. Make sure you ask about the sealing process when contemplating new granite countertops. The sealer has a life time warranty as long as normal cleaning processes, such as soap and water or a granite cleaner is applied. For hardened spills that won’t seem to come off with a normal cleaning process, use the edge of a razor blade to gently remove debris.