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.
Conservation and restoration of ancient Greek pottery
Basic mechanical cleaning can remove dirt, dust, and grime. Cleaning solvents and water can also be used to remove dirt, varnish, wax, in-painting, or adhesives. Acids should be used with caution. Desalination is a cleaning method that removes as much soluble salt from the porous fired clay as possible. Fragments are soaked in highly purified water for multiple days. The water is changed regularly until salt levels are reduced.