From experience in trying. Don’t put copper base ancient artefacts / coins in the ultrasonic cleaning machine. It dissolves the metal like a harsh electrolysis. I ruined a few cruddy romans.
I add a couple of drops of Fairy liquid which works better for me, plus ultrasonic waves will penetrate into blind areas such as tubes and crotal bells etc.. I have a model with a thermostatic heater which cleaned my lawnmower carburettor to perfection (my original reason to buy) Thanks again for your video
I was actually surprised hiw well it cleaned the items... I had one years ago and it was useless and put me off using another... but a decent one does actually work... I may even go for a more expensive model if they get better