In reply to the Stonware, the oils from foods is what seasons the stone, by using soap that would counteract the seasoning process and also make your stones soapy smelling. Instead use warm water and the scraper tool that comes with your stone to clean it. They are very easy to clean.
To Deep Clean your stone prepare a baking soda paste by mixing 1/2 cup baking soda with 3 tablespoons water. Apply baking soda paste to stone and let sit for 15-20 minutes. Scrape off excess paste using the Nylon Pan Scraper, then rinse and dry.
Bacteria is actually better removed by friction, which is why it is always good to scrape your stone. Bacteria is also killed when the stone is in the oven. Pampered Chef has never had any problems nor worries about stones not being clean for baking purposes.
Anyway, just wanted to address any concerns.