CharlieNC
Gold $$ Contributor
Never tried Seafoam but it makes sense that any cleaner like that should help. Gumout carb cleaner or an intake manifold cleaner spray should work too since they attack carbon. Don't know what it would to to any finishes so would require a test.
I tried M-Pro 7 and didn't really think it did that well on copper. It does seem to work on carbon. Sometimes I clean with it first before using the Wipe-Out. Avoid contact with any ammonia based products with your brass as it may harden it and make it brittle.
T I have also used spray carb/injector cleaner too and it doesn't work nearly as well as the Seafoam, which is a bit more viscous and contains different additives. I use a couple of dirty powders and nothing else I've tried comes close to Seafoam, but always looking for better.