• +1 for ultrasonic cleaner. £30 on Amazon - just don't put the whole watch in; the vibrations will almost certainly help water penetrate the seals on a waterproof watch.

  • I've actually torture tested a watch case by repeatedly cleaning it ultrasonically. Water ingress was never a problem.

    What I do worry about is what happens to lube in the movement.

    Either way, as you say, bad idea!

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