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.
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.