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 shipwreck artifacts
Leather must be washed to remove any ingrained dirt; Its ideal to wash leather with water alone. Depending of the condition of the leather, there are variety of mechanical cleaning techniques that may be used and required. Materials such as soft brushes, water jets, ultrasonic cleaners, and ultrasonic dental tools are effective cleaning tools for leather. When leather is mechanically cleaned with a soft steam of water, soft brushed and sponges can also be used. In the case of consistent impurities, leather can be cleaned by chemical means, with the use of small amounts of non-ionic detergents. The chemical cleaning must be followed with a rinse under a stream of water.