When I took in a particularly dirty bracelet on a watch, I always did ultrasonic. But I had a triple play plan.
Step one was removing it, doing a soak in warm water with a clear liquid soap solution. Then soft brush on both sides laterally and horizontally.
Step two: Long rinse and then into the ultrasonic. Ammonia in that solution helps the cleaning effort. And when dumping the ultrasonic bath liquid you can see fine grains of dirt.
Step three: Long rinse and then steam shots while on Turkish toweling or folded paper towels. Even after the first two steps, some more grey stains appear on the toweling. This last step insures no soap, ammonia or detergent remains on the metal.
So I think the 3-step method gets the best results.
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