Just a couple of things:
1. You don't have to worry about going through a liner. Original Luger barrels are not lined.
2. Frosting, as opposed to outright corrosion/pitting, is a reaction to the neutralizing ammonia solution used to counteract the corrosive primers used in military ammunition even today in some areas. FYI, ,most if not all modern ammunition used by Western Forces employ non-corrosive primers.
If the ammonia solution is not rinsed away, typically by soapy water, "frosting" occurs.
So, clean away, use whatever cleaning material, and brush/swab/patch you are comfortable with. What is done, has been done, you really can't improve it or harm it using modern cleaning materials and techniques.
John
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