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Soaking
As a gunsmith, I have used a 9X13 metal baking pan and placed the handgun in it after removing the grps then filled to cover the handgun with ordinary paint thinner and let sit for a day or more depending on how gummed up it is. It works very well at removing anything gumming up the action and removes old oil. Also it is a lot less expensive than many of the products like gun scrubber and will not harm metal finishes.
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