Zibo Huashi Cleaning Co., Ltd., founded in 1985, is one of the earlier limited liability companies. Its technology comes from the Thermal Engineering Research Institute of the Ministry of Electric Power. The company has A-level qualifications for boiler chemical cleaning and industrial equipment chemical cleaning issued by the China Boiler and Boiler Water Treatment Association, comprehensive first-class cleaning qualification certificate issued by the China Chemical Machinery Power Technology Association, quality, environment, occupational health and safety and health, safety and environmental management system certification issued by China Fangyuan Certification Group Co., Ltd., and safety construction permit issued by the Shandong Provincial Department of Housing and Urban Rural Development. After its establishment, the company mainly engages in chemical cleaning of boilers, tank cleaning, cracking furnace cleaning, and cleaning of large-scale equipment projects in industries such as petroleum and petrochemicals in thermal power plants.