[Rick Deckard]

I can only add anecdotal evidence: I used to buy from a German dealer for 25 years while living in Europe. In all, I purchased at least 20 watches, all Rolex, from him. He used to put any Rolex "as is" in the ultrasonic cleaner before selling it or as a courtesy cleaning. I never had any issues with the watches, even the ones that went into the cleaner several times. And about half of them made it to the 10-year mark and an RSC service before being sold and never left COSC norm before going. At the RSC, nobody ever said anything about loose screws either.

Again, just my experience, not recommending that anybody do it.