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If you don't have a heat gun try boiling the parts.
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+1. Although I don't have a Yugo, in my experience, boiling water is by far the most reliable and cleanest method of removing cosmo.
It's best to do this outdoors.
Get a campstove or turkey fryer, and an old or cheap stock pot you won't use for anything else. Fill with water, bring it to a nice rolling boil, and dunk the parts in it. For a pistol slide, I suggest hooking it to a piece of coat hanger wire so you can move it around and get boiling water into all the nooks and crannies. For small parts, I simply drop them in the water, then drain everything through an old kitchen strainer. After 30sec or so, you should see drops of viscous yellow or orange fluid floating on top of the water- that's the cosmo.
You'll obviously have to re-oil the parts afterwards.