Any part by ultrasound
Ultrasounds are waves transmitted at frequencies which in general are beyond the range detected by human ears, and in some applications (sonic system) can be used to clean materials and pieces. It works like this:
As the sound waves emitted by the transducers spread out in the solution with water and the chemical product in the tank, they produce alternating high and low pressure in the solution.
Millions of microscopic bubbles are formed and expand in the low-pressure stage. This process is known as CAVITATION, which means “formation of cavities”.
The bubbles collapse and implode in the high-pressure stage, releasing enormous amounts of energy. These implosions act like a small army of tiny cleaning brushes. They work in all directions, attacking all the surfaces and invading all the hollows and apertures.