For everyday cleaning there are a number of products available on the market specifically designed for natural stone (such as Black Diamond brand stone cleaners), or a solution of 2 parts water to 1 part Simple Green works well. A very simple method is to use warm soapy water and wipe the entire counter surface on a daily basis. You do want to avoid common household cleaners that have a bleach or ammonia base. These cleaners can damage your sealer and leave your counters more susceptible to stains.