I thought I knew how to clean a Winchester! A few months back I came across my 2nd Mod 70 Target in 30-06, I gave it a quick clean and wipe thru with Corrosion X and checked the chamber,bore in the sunlight, beautiful bright and shiny. The gun is a '54 vintage and is in good 95+% shape, all original, non CMP and I can tell it was not shot a lot as original owner said. long story short I put in to really clean it today and patches keep coming green, I can tell looking in the muzzle that there seems to be a thin copper color that will not brush out! What cleaner do you folks recommend to get any and all copper out of an old CM barrel. The chamber ,lands and groves look new! I'm thinking the copper was never taken completely out from day one on. thanks The ole gal shoots like a house afire even with cheap Super X ammo I zeroed scope with, shot a couple sub 1/2 moa with Fed GM 168 gr ammo and some 180 gr hunting ammo thanks