Cast-iron cookware
Because other cookware cleaning techniques like scouring or washing in a dishwasher can remove or damage the seasoning on a bare cast-iron pan, these pans should not be cleaned like most other cookware. Some chefs advocate never cleaning cast-iron pans at all; simply wiping them out after use, or washing them with hot water and a stiff brush. Others advocate washing with mild soap and water, and then re-applying a thin layer of fat or oil. A third approach is to scrub with coarse salt and a paper towel or clean rag.
Dutch oven
After use Dutch ovens are typically cleaned like other cast-iron cookware: with boiling water, and a soft brush or sponge. Where possible, a cleaned and freshly oiled Dutch oven should be stored in a clean, dry location with the lid ajar or off to promote air circulation and to avoid the smell and taste of rancid oil. If the Dutch oven must be stored with the lid on, a paper towel or piece of newspaper should be placed inside the oven to absorb any moisture.