the ultrasonic cleaner...
it works okay, but it won't remove everything
it did a reasonable job of this complicated part in the tuner unit, photos attached
i used only water and a bit of shampoo in the cleaning bath

i have two of this particular assembly, the other one is brighter and better looking, probably will go with the other one

maybe i should try baking soda or some stronger chemicals in the bath, i heard folks use evapo-rust directly in the cleaning bath
-s
Attachments
dirty.jpg (106.79 KB, 163 downloads)
bath.jpg (107.68 KB, 171 downloads)
after.jpg (140.76 KB, 170 downloads)