Scrape out foods with a nylon scraper. If foods are stuck to the bottom, pour water in the pan and let it soak just until the food loosens. Alternatively, make a paste of 1/2 cup of baking soda and 3 tbsp. of water, then pour it in the stoneware and gently scrub with a nylon scrubbing pad.
Hand wash the stoneware in hot water. Do not add any type of detergent.
Dry the stoneware well with a dish towel.
Turn the oven on and set it to a medium setting, about 300 degrees F.
Lightly spray the inside of the stoneware with cooking spray, coating the entire interior surface.
Place the greased stoneware in the oven for a minimum of 15 minutes.
Do not wipe out the interior when the pan cools.