Ultrasonic cleaners use high-frequency sound waves (20-40 kHz) to create cavitation bubbles in cleaning solutions that implode, dislodging grease, dirt, and contaminants from intricate surfaces. Hospitals sterilize surgical instruments, dental clinics clean tools, jewelers restore rings, and mechanics degrease parts. Small desktop units (0.5-10L) handle glasses and watches; industrial tanks (1000L+) process automotive components. Safe for delicate items, they reach tiny crevices traditional methods miss, with heated solutions boosting efficacy for oils and proteins.