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[Ultrasonic cleaning] The vibrations produced by ultrasonic waves generate microscopic high pressure air bubbles. The impact waves that are produced when the bubbles are blown off cleanly and remove dirt that cannot be removed by cloth, brush, water flow, etc.
What is 42,000 Hz? With the number of times that vibrate water in a second, home sonic ultrasonic cleaner vibrates up to 42,000 times in a second to remove fine dirt.