Through the study of the formation mechanism and physical parameters of the dirt on the inner wall of the liquefied petroleum gas (LPG) tanker, the main components of the fouling in the upper and lower layers are determined, and a new water-saving and energy saving cleaning method which can effectively reduce the pressure of descaling jet flow is proposed. The best jet hydraulic parameters were determined by establishing the scale removal mechanics model and experimental verification method. With the aid of the FLUENT fluid simulation analysis software, the jet hitting force of the different jet target and the incident angle was compared and experimentally studied. The optimal target distance of the maximum cleaning efficiency of the high pressure water jet is 85 mm, the incidence angle is 10 degrees, which can provide a theoretical basis for further research on the new technology of water saving cleaning, and has a certain guiding significance for the research and development of the corresponding cleaning system and equipment.