1 Chemicals used in industry, science and photography as well as in agriculture, horticulture and forestry; chemical preparations for cleaning boilers and process furnaces; chemical preparations for on-line cleaning of boilers, process heaters and process furnaces; chemical preparations and chemical compositions for removing or conditioning deposits from heat exchange surfaces; chemical preparations and chemical compositions for preventing build-up of deposits on heat exchange surfaces; chemicals, chemical preparations and chemical compositions for use in removing or inhibiting formation of fireside deposits on heat exchange surfaces, including goods for use in the conditioning, cleaning or treatment of boilers, process heaters, process furnaces, process heaters and boilers; solutions of alkali-nitrates for removing or inhibiting formation of deposits on heat exchange surfaces; chemical substances for removing or inhibiting formation of fireside/gas side deposits