Cleaning cases is good but it's not rocket science and how we do it really doesn't matter in the end, nor does getting them surgically clean or highly polished matter. I've used stainless, have a ultrasonic but I went back to cleaning my cases with a vib tumbler with either cob or nut without polish. Both cob and nut media are sold, each has its fans because both work; seems some nervous guys use a mixture, just to make sure they get it right I suppose.
I've never bothered cleaning primer pockets for high volumes of practice ammo, rifle or handgun. I've always cleaned the primer pockets in my hunting ammo and during load development ... but I've not kidded myself that it matters.
I dont clean primer pockets except for hunting & match cases, still use the same tumbler I bought in 84,corncob is prefered. Throw em in , turn it on, and let er run.
And the only reason I quoted Boomtube is because for once I cant find a thing wrong with what he said.
Swifty