I bought a 1972 vintage Winchester 9422 LR at a local pawn shop yesterday. Still waiting for background check to clear to pick it up. Seems I'm 16 hundred and some on the waiting list. The rifle is in really good condition, "EXCEPT" the previous owner left it leaning or lying on something damp or caustic or ???, on the left side of the receiver. This caused an etching into the nice bluing. It isn't very deep, (just barely feel it with fingernail) but did get below the bluing. What would be the best way to deep clean the etching, and what would be reccomended to touch up the area? I have some Birchwood Caseys Perma-Blue paste, but didn't know if it would have a detrimental to the factory bluing? I will try to post pics when I get the rifle.