Clean bracelet with an ultrasonic jewelry cleaner?

[S52]

After reading several recent threads regarding bracelet stretch and cleaning, I decided to go to town on my daily wearer 16710 with warm soapy water and a q-tip/ old toothbrush...

I always thought I did a good job of hand washing it every week or two in the sink with some hand soap and water... but I was wrong

I was shocked at the amount of grime and nastiness that seeped from the watch. The water in the sink turned a gray/ blackish color

My wife has an ultrasonic jewelry cleaner device... has anyone ever tried one to clean a bracelet? I'm feeling more paranoid now and wonder if it could get any more crud out from between the links!

I would imagine the bracelet should be removed? Doesn't seem like dunking the entire watch in the ultrasonic cleaner would be a great idea...

Any advice?