Pistol brass does not need much cleaning. If it does need to be cleaned, then 2 hours in hot water with Dish Washing machine detergent (I use Powerball) works great, after depriming to aid drainage. Rinse in hot water and dry in the sun or in front of a fan.
I load rifle and pistol, and usually do not need to clean my pistol brass.
Most of what I use is nickle plated, and they seem to just stay clean. If you are only going to load pistol, then you do not need a tumbler.
Rifle brass is a much different matter. I clean those in dish water, then lube and size, then tumble the lube off. Brass cases shine up well in a tumbler with 1/2 walnut & 1/2 corn cob with some auto polish.