Pampered Chef stoneware is not supposed to be washed with soap or detergent. Detergent can get into the porous surface of the stoneware. You must use the little brown plastic scraper that comes with the stoneware.
Allow the stoneware to cool completely before cleaning.
Place the stoneware in the sink and hand wash it in water separately from any other dishes.
Fill the dish with hot water and let it soak overnight. In the morning, use the plastic scraper to remove any remaining food. You can also run hot water over the surface as you scrape any remaining food off with a nylon scraper.
Use a dish towel to hand dry the stoneware before it is put in a safe place for storage.