Love to load and shoot. Been doing it for over 50 years and the only primer pockets Ive cleaned was when I was shooting pt blank IBS, just because I could. I think cleaning brass to have shiny brass is just fine but not for me. Dirty brass, pistol or rifle, surplus rifle gets deprived with a Lee universal and the brass is washed and agitated in a HOT solution of citric acid and Dawn. Rinse with hot water and spread on towel in furnace room. Citric acid will "passivate" brass, which slows the tarnishing substantially. Brass is lubed in bulk w/Lee case lube , inside and out. Leaves brass with a flat shine and is clean primer pockets and all. Function is fine in bolts pistols, AR15 &10s. ETC. Only primer pocket issue Ive ever had was a wet one when I was in a hurry to load shotshells.