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I distributed laboratory commercial ultrasonic cleaners for quite a few years (11].
There are specialised cleaning solutions/surfactants that increase the efficiency of these units depending on the type of contamination and the material of the item that requires cleaning.
Water is an average cleaning solution compared to some of the proprietary solutions that are available.
I use WristClean solution in my ultrasonic cleaner and I immerse the watch after a pressure check.
The low Watt ultrasonic cleaner I use does not have enough power to cause a problem with the seals.
After cleaning I run the solution through a fluted filter back into the bottle.
Scottish thing I suppose but it still works just fine.
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