What is the best product for cleaning stone?

Clean stone with mild dish soap, stone soap or a neutral cleaner that contains no damaging acid. Use only a small amount of cleaner on an already-damp surface, using a soft cloth on counters or walls and a mop on floors.

After using the cleaner on the stone surface, rinse the area completely, and dry it with a cloth to remove all traces of the cleaning solution. To keep the stone protected and looking its best, use a wax-based finish every so often. Spray on the finish, then buff it with a nylon pad to ensure the product penetrates the stone's surface.