I use regular ultrasonic gun cleaner from Brownells and make the solution a little stronger and leave it in a little longer. The "brown dip" gets a little loose and can be wiped off with some good gun cleaning solution on a cotton patch. Then the rinse in water and dry with compressed air and then the ultrasonic gun lube.
You must completely dissassemble the entire gun to the smallest part and pin and just do one pistol to get best results. The "dip" will still stick to areas of wear under the dip on the original finish.
Unless the solution is super hot for cosmoline, it will just find its way into every nook on a gun. I usually get most of the cosmoline off the gun first then make up a new solution with super hot water to get rid of the rest in the ultrasonic cleaner.
Then you will have the "ring around" the stainless tub with a bath line of cosmoline where the fluid level was .... been doing this for 10 years with the ultrasonics!
Mark
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