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I was given to understand that most brass cleaners contain ammonia which will weaken the brass over time. I like the walnut tumbling media from Lyman that contains jewelers rouge. I get lovely clean polished cases out of it.
I used to add polish to the mix, now I just turn it on and let it run however long it needs until they come out clean. I have a lot of brass that was run through corn cob media with ammonia based polish, never a problem with powder or primers, never seen any decrease in the life of brass either.
I add a bit of ordinary Turtle Wax liquid car wax before each tumbling session. I find that it really helps with cleaning the case necks, while leaving the brass nice and shiny.
Newbie to reloading but I've been using the green treated cob and seems to do a decent job so far. I've been told the red tuffnut version shines up the brass even more.
I have used Brasso with my walnut shells for decades & have always been pleased with the results. Like the looks of shiney brass & also believe that clean brass is better for my dies.
I just use plain tumbler media and let it run overnight. Come's out cleaner and shinier than most factory ammo. Tarnishes a bit again over time. I'm not convinced there is any real value in making your brass look nice, other than if you desire it.
I can't remember which reloading manual it was, perhaps Lyman, but it stated not to expose reloading components, mainly powder and primers to ammonia fumes.
I know I'm way too anal about brass polishing but I use Lyman green treated corn cob to do the initial polish to remove any heavy fouling and then tumble again in fine ground untreated corn cob with a small dash of Flitz media polish. Brass comes out blazing bright. I figure that if I can't be the best shooter I'll at least have the best looking reloads on the line.