I use a 40 dollar rock tumbler from Harbor Freight. Fill 1/2-3/4 full with brass that has been rinsed and decapped/deprimed. A squirt of Cascade dishwashing detergent and a small handful of stainless steel pins. Run it for 2-3 hours and it looks great. Cleans the primer pockets like new.
When done, pop the top, dump everything in a strainer in the slop sink, let it dry for a day or so.
It works for me. I like wet tumbling as it has no dust and gets everything really clean. I'm also not in any kind of rush, so a couple of days processing time is no big deal. And, the brass really does look like new.
Good luck.
C