<https://forum.308ar.com/topic/24476-sonic-cleaner/#comment-360529>
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"I use almost pure water in mine. With a very \"simple\" soapy solution \"made for ultrasonic cleaners\". \n \n\n\n\tI'm not sure what one would use in an engine shop. Even pure water is fine for my current use. \n \n\n\n\tThe \"heat\" in the water can't be above 212 anyway; that would be boiling. But it does get steamy... Quite warm to the touch. (Ok; maybe with cleaning solutions... But not by a LOT.)\n \n"
<https://forum.308ar.com/topic/24476-sonic-cleaner/?tab=comments#comment-360562>