I used plain powder solvent (plain Hoppe's #9) once on a dirty barrel. When I looked in the muzzle, I saw the cleanest, shiniest copper in the grooves.
So I added Sweets 7.62 for that one. I am not a chemist, so I follow the standard precaution to not mix cleaning chemicals since there may be an interaction.
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He finally figured out by talking to his gunsmith that Sweets also reacts with brass. The blue patches were really from his brass cleaning jag once the copper was removed.
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I bet a bunch of us learned this the hard way. The bronze brushes have copper, too. So that is why using no metal brushes is good while trying to clean copper.
Lee