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 lighthouses
Basic preservation of lighthouse masonry usually includes gentle surface cleaning. Appropriate methods for cleaning are determined by the type of masonry that exists on the building. Some cleaning methods include water, chemical, and laser. There are multiple water cleaning methods. Soaking is a process where the masonry undergoes a prolonged exposure to misting water to remove dirt. Water washing uses a light to medium pressurized stream of water. Some water washing may use the addition of detergents to increase dirt removal. Chemical cleaning is also an option, but may be too harsh depending on the makeup of the masonry. Chemical cleaners are either acidic or alkaline. Laser cleaning is effective, mostly on smaller areas of masonry, but can be costly. Occasionally, a lighthouse may be weatherproofed through covering the masonry with paint, stucco, or whitewash/lime mortar wash; but only if these are historically accurate for the structure. Due to the differences in materials and construction techniques, only an experienced architectural conservator should be contacted for conservation or restoration work.