China's industrial cleaning industry began in the late 1970s. The first real cleaning company in China was "Shanghai Pujiang Water Treatment Shop", which was listed in January 1979 to clean boilers. According to incomplete statistics, there are hundreds of thousands of cleaning engineering companies in China, including more than 1500 in Shanghai, more than 1200 in Guangzhou, more than 1000 in Beijing, more than 700 in Shenzhen, more than 600 in Xi'an and more than 400 in Lanzhou (vehicle cleaning and household cleaning are not included). Employees of about 10 million people, has ranked in the forefront of China's top ten service industries. The scope of cleaning also extends from single boiler cleaning to petroleum, chemical industry, electric power, machinery, coal, nuclear industry, ship, second transportation, food, textile, public facilities, municipal construction and other industries; cleaning agent also develops from simple tri-acid and two-alkali to multi-functional, low-pollution and high-efficiency green cleaning agent; cleaning equipment also from the start of towels, brushes, barrels, pumps and simple. Single cleaning machine, developed to today's advanced and efficient high-pressure water jet equipment, ultrasonic cleaning equipment, PIG pipeline cleaning equipment, ultraviolet-ozone cleaning equipment, laser cleaner, cleaning robot and automatic multi-functional cleaning platform. Institutionally, cleaning companies account for 10% of the state-owned enterprises, 20% of the shareholding system, 15% of the chain operations, and the rest are private individuals and some "cleaning guerrillas".