52 DEGREASING AND OIL REMOVING MATERIAL FOR INDUSTRIAL USE, INCLUDING BUT NOT LIMITED TO ADDITIVES FOR CLEANING OIL BURNER TIPS, SPRAY NOZZLES, AND FUEL OIL HEATERS; CLEANING AND DESCALING COMPOSITIONS FOR BOILERS, EVAPORATORS, CONDENSERS, HEAT EXCHANGERS, HEATERS, COOLING TOWERS AND WATER JACKETS; AND RUST REMOVAL COMPOUNDS