An ultrasonic cleaner is an automated device that uses high-frequency sound waves (usually 20 to 40 kHz) to create millions of microscopic bubbles in a liquid. When these bubbles collapse—a process called acoustic cavitation—they release intense energy that lifts dirt, grease, and tarnish from object surfaces. This liquid-based scrubbing can reach deep into microscopic crevices, blind holes, and intricate hinges that manual brushes or sprays cannot touch