In general, cleaning a bathroom or kitchen granite countertop requires only mild soap and water. As stated before, antibacterial soaps can help but even warm water and friction will greatly reduce the presence of germs. A once a week scrub down of your granite surface is sufficient to keep it clean. Of course, you should clean a granite countertop after every use. Some olive oils and cooking oils can leave slight stains if left for an extended period of time. This process does take a while but it’s still advisable to clean up when done.