The clean function of ultrasonic wave is to use the waves over the frequency of human hearing conducting within the liquid. When ultrasonic waves, longitudinal waves, are conducting within the cleaner, which pushing function for the medium will enable the pressure within the liquid to change and produce mini vacuum bubbles referred as "Cavitation".

When gas bubbles are pressed to break, they will produce so great excitation energy as to separate the dirts sticked to the dead comer of object as well as well as to enhance clean effect of cleaner, with high frequency, short wave length and strong penertrating power, so that it can completely clean the article having hidden seam or complex structure.