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Copied from a previous post:- "The first thing I do when I strip a watch is wash the parts in a container with lighter fuel. This gets rid of most of the oily residue before using the ultrasonic bath. If the movement is really gummed up, I will let the parts soak overnight. I use a small amount of water soluble “carburettor cleaner” dissolved at a ratio of about 1 part cleaner to10 parts water in the ultrasonic bath. I heat this up to about 30C then clean the parts for 3mins. The parts are then rinsed I fairly hot water and rinsed again in alcohol before being gently blow dried on a clean sheet of good quality kitchen towel. If I am having real difficulties cleaning the parts (dried oil in jewels) I will put the movement in a jar of lighter fuel and hold the jar in the ultrasonic cleaning solution for three minutes at a time until the jewels are clean. The ultrasonic vibrations penetrate the jar and agitate the lighter fuel. DO NOT PUT LIGHTER FUEL DIRECTLY INTO THE ULTRASONIC CLEANER!! This maybe conflicts with professional cleaning methods, but it works for me."