I use a squirt of dishwashing liquid in my steel-pins tumbler. I buy a big bottle of it at Dollar Tree. I really like how a pins tumbler gets the primer pockets clean. I guess the pins also get inside the case, cleaning in there too. The $170 or so I paid for my Frankford Arsenal example was some of the best money related to firearms I've ever spent. Beats the ultra-sonic thing I had before the tumbler all to helsinki.
The American People must forever retain the Right to own the arms best-designed and best-suited to bring an expeditious end to any tyrant whom would deign to separate The People from their Liberty as bestowed upon them by God.