High-pressure washing is a technology that uses high pressure washer to generate strong pressure water flow for flushing and cleaning. It has the characteristics of deep cleaning, high efficiency and time saving, environmental protection and hygiene, and has been widely used in various aspects of environmental sanitation and cleaning operations. In recent years, in order to continuously improve the quality of the urban environment and create the "cleanest city", the Qingdao Municipal Administration Bureau has shifted its thinking from "sweeping" to "flushing", making full use of high pressure washing technology to inject stronger "water power" into sanitation operations.