It is a by-product of processing steel and contains metallic particles that can cause ferrous staining. C. Alkaline, Corrosive, and Biocidal Cleaning Materials 1. Calcium hypochlorite is available from swimming pool suppliers. A suggested cleaning solution is one ounce calcium hypochlorite to one gallon hot water. Solutions of household ammonia are recommended for cleaning light colored stones.
Ammonia is particularly effective for the removal of biological growth.
One cup ammonia to one gallon water. Quaternary Ammoniums have a slightly different chemical structure than ammonium hydroxide. They are especially effective for the removal of biological growth, particularly stubborn black algae. Quaternary ammoniums are available from swimming pool suppliers and list ingredients such as alkylbenzyl trimethyl ammonium, benzyl alkyl dimethyl ammonium chlorides, or benzyl aklyl dimethyl ammonium bromides. It can cause the formation and deposition of soluble salts.