Morris Minor Owners Club

I've managed to remove the trafficators from my 1957. One of them looks really quiet corroded and although I can hear the solenoid trying to work, the arm doesn't flip up. Instead of just oiling it I'd like to take it all apart and clean it up, but there are lots of quiet intricate pieces.

Can theses be dropped in a ultrasonic? I'm just worried that any damp may cause a short.

Any help and advise would be gratefully accepted.