When using an ultrasonic cleaner for cleaning, users may encounter situations where the cleaning effect does not reach the desired level, or even fails to clean thoroughly. At this point, we need to identify the reasons for the unsatisfactory cleaning effect. So, what are the causes of the failure to clean thoroughly? The following are four factors that affect the cleaning effect of ultrasonic cleaners: First, the content of gas in the cleaning solution. If there is residual gas (non-cavitation nuclei) in the cleaning solution, it will increase the loss of sound propagation. In addition, the gas that diffuses into the cavitation bubble during its movement, When cavitation bubbles collapse, the intensity of the shock wave will be reduced, thereby weakening the cleaning effect. Therefore, some ultrasonic cleaning equipment has the function of degassing. When starting up, it first performs vibration at a power level lower than the cavitation threshold, and degassing is carried out through pulse or intermittent vibration. Then increase the power to the normal cleaning power level for ultrasonic cleaning; Some ultrasonic cleaning equipment is equipped with a vacuum degassing device (so-called vacuum degassing), whose purpose is also to reduce the residual gas in the cleaning solution. Second, the influence of standing waves. The cleaning tank is a confined space. When ultrasonic waves propagate from the sound source to the liquid surface. Standing waves are formed by reflecting back at the interface between liquid and gas. The characteristic of standing waves is that the sound pressure is the lowest in some areas of liquid space and the highest in others. This will cause uneven cleaning. To reduce the influence of standing waves, sometimes the cleaning tank is deliberately made into an irregular shape to avoid the formation of standing waves. Sometimes, in the ultrasonic power supply, a sweep frequency method is adopted, so that the point with the minimum sound pressure is not fixed in one place but constantly moves to achieve a more uniform cleaning. Third, the flow rate of the cleaning solution. It is best for the liquid to remain stationary during the cleaning process. At this point, the growth and closure movements of the bubble can be fully completed. If the flow rate of the cleaning solution is too fast, some cavitation nuclei will be carried away by the flowing liquid, while others will leave the sound field before reaching the entire process of growth and closure movement, thus reducing the overall cavitation intensity. In the actual cleaning process, sometimes to prevent dirt from re-adhering to the cleaned items. The cleaning solution needs to be constantly updated. At this time, it should be noted that the flow speed of the cleaning solution should not be too fast to avoid reducing the cleaning effect. Fourth, the acoustic characteristics of the items to be cleaned and their arrangement in the cleaning tank. Items with high sound absorption, such as rubber and fabric, have poor cleaning effects, while those with strong sound reflection, such as metal parts and glass products, have good cleaning effects. The smaller side of the cleaning parts should face the sound source and be arranged at a certain distance. The items to be cleaned must not be placed directly at the bottom of the cleaning tank. Especially for heavier cleaning parts. To avoid the vibration of the bottom plate of the shadow groove and also to prevent the cleaning parts from scratching the bottom plate and accelerating cavitation corrosion. It is best to hang the cleaned items in a tank or hold them in a metal basket and hang them. But it should be noted that it should be made of metal wire. And as much as possible, make baskets with larger Spaces using fine wires to reduce sound absorption and shielding. The quotations of ultrasonic cleaners available on the market vary, and so do their cleaning effects. This is mainly due to the production processes and principles of the machines. So when purchasing the ultrasonic cleaner , one should consider the cost performance of the ultrasonic cleaner