Le Creuset cookware, established in 1925, began producing cast iron pots in France. Today Le Creuset also sells ceramic and stoneware cookware, including casserole pans. While durable, Le Creuset casserole pans can develop stains on their surfaces. Removing these stains involve softening the crusty mark so it can wash away without marring the surface of the pan.
Fill a sink with hot water and two squirts of liquid dish soap. Place the Creuset casserole pan into the soapy water and allow it to sit for 15 minutes.
Wipe the pan with a soapy dishrag. Use medium pressure to wash away the stain. If the stain remains, lay the casserole pan on a dish towel on the counter and apply 1 tbsp of vegetable or olive oil to the stain.
Rub the stain with the soapy dishrag as it lays on the dish towel. Pour additional oil onto the stain if needed to dislodge it completely from the pan. If the oil fails to remove the stain, allow the pan to soak in the soapy water another 30 minutes to further loosen the stain.
Wash the pan in the soapy water to remove the oil. Rinse the pan with hot water and dry it with the dish towel.
Do not use harsh cleaners or abrasive tools on the Creuset casserole pan as you could scratch the surface.