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I have used Kroil successfully to remove rust & leave whatever permanent finish is left, Kroil advertizes it penetrates one millionth inch & my experience over couple days loosens rust so with a rag with Kroil on it rubs pretty clean.

Rust seems to be granular which Kroil loosens.

After gun bores cleaned with bore cleaners that would swab leaving a clean patch & look pretty good, then given a Kroil treatment the patch came out dirty several times till Kroil got it clean.
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