This video from Horology Zone is a simple demo showing how easy it is to clean something in an ultrasonic cleaner. In this case, it is a watch bracelet. Note that watches – the mechanical variety with cogs and wheels – can be cleaned too. But that requires a proper knowledge of the intricacies of a mechanical watch as you need to disassemble the watch first. It should not be undertaken by those without sufficient know how. You might end up with a bunch of small cogs and things left over! Nevertheless an ultrasonic watch cleaner can do wonders to restore your watch to mint condition.