In the late 80s or early 90s, National Physical Laboratory (NPL) in the UK researched the frequencies and power levels that could be used for ultrasonic cleaning of electronic boards. The resulting reports by Dr. Colin Lea or maybe Peter Foote were aimed at convincing stubborn military types that ultrasonic cleaning could be used to clean boards safely. Dr Chris Hunt or Alan Brewin may be able to direct you to the reports.
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