Quoted from Jaywoods06:Share your biggest pinball mistakes. Laugh at others miseries and let them laugh at yours.
So I was going to clean these and I use an ultrasonic cleaner on some of my pinball parts so I decided to try it on these....... well it didn't go as planned...... take a look at the before and after photos
The heating element is ok to use with metal parts, but is best avoided when cleaning plastic parts.
One time (and I'm not sure if anyone was even aware of this before I attempted it), I made the mistake of trying to de-rust older metal coin mechs. That ended up stripping the cadmium finish off the coin mech down to the bare metal. I should have left them alone. Oh well.