Hi Folks,
An ultrasonic tip I saw on utube -
for smaller parts in larger ultrasonic tanks, when you need to use something stronger as a cleaner, like acetone,
put the part and acetone in a glass jar with a good lid, put water in the tank, put the glass jar in the water.
A plastic jar works, but a more rigid glass jar transfers more energy inside the jar.
Thanks and good health, Weogo