Originally Posted by
doug darter
An ultrasonic cleaner can be useful if you are absolutely certain that your watch is water tight. Otherwise any of the solutions above can be worth trying.
If I want to give my watch a thorough clean, I use one of the spray kitchen cleaners, and then use an old ultrasonic toothbrush. You should see the muck falling out of the bracelet.
A proper ultrasonic bath needn't be expensive. Mine,with a three zone timer and heater came from amazon with a three year warranty for under £50. Bargain!.