Question from me that is. I'm currently working on a Seiko digital chronograph that my neighbour, who was given the watch at a garage sale, gave me. It wasn't working so I replaced the dead battery (that hadn't leaked) and it's ticking along nicely. My question is, can I put the caseback with the integral piezoelectric buzzer in the ultrasonic cleaner? 1. - Yep, no problems. 2. - No, only an idiot would do that. 3. - Maybe, tell us how it goes. I've cleaned it with peg wood and IPA so it's sparkling, but I realised I didn't know if it was sensible/safe to do so. As any post is rubbish without pitchers, here's what it is.