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Several questions about ultrasonic washers

Ultrasonic cleaning is in fact a very effective method of cleaning PCBs. Myth busted. Ultrasonic cleaning doesn't work – Again, this is false. Ultrasonic cleaning is incredibly efficient at removing contaminants when the optimal chemistry, cleaning cycle time, and temperature are used.
What liquid is used in ultrasonic cleaning?
In certain instances a volatile solvent such as IPA, acetone or toluene is recommended for ultrasonic cleaning operations.
What can you not clean in an ultrasonic cleaner?
Some items or materials are likely to get damaged and must be cleaned with a different method. Soft gemstones or organic jewelry. Lapis lazuli, emeralds, turquoise, malachite, tanzanite, opals, coral pieces, amber and pearls can not be cleaned in an ultrasonic cleaner.
Can I use tap water in my ultrasonic cleaner?
Lastly, it should be known that you can use normal tap water in your ultrasonic cleaner if you wish. Distilled water will provide the same results as tap water, but deionised water may prevent streaking

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