The nice thing about my cleaning method is I do it at the range after shooting. Quick and easy before I head home.
I would add to that most oils or greases will oxidize brown. Spent years being scared of such patchesIME: It ain't rust. The three small patches have crud from powder residue on them. It's sometimes hard to remove powder residue from the bottom sides of the grooves.
About every third cleaning i run a brush to remove that residue.
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