I use Turtle Wax Polishing Compound - comes out super shiny.
Turn on the tumbler, squirt in 1.5 to 2.0 ounces and stir it in with a screwdriver until it mixes completely. Your brass will look like gold jewelry if you let it run for 30 minutes.
Throw a 2"x3" piece of dryer sheet in the tumbler, and it will keep the dust down.
I have 2 batches of media. One is dirty and has car polish and that's what I run my brass through on initial sizing. I use Lizard Litter because it flows out of 223 brass much easier. I then have a clean batch of LL that I use to clean off all my case lube after resizing. I bought a 10 pound bag of that stuff about 4 years ago and I'm still using it.
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