I usually use Dillon Rapid Polish to clean & polish cases.
3 or 4 cap fulls, per instructions. ( less than a half a shot glass)

But if I run out , I've used Nu Finish cut 25% to 50% with odorless mineral spirits. Shake well.
I put less than half a shot glass in with the walnut hulls, let it mix for about 5 mins. then add the brass.
If you throw in the brass to soon before it has mixed, it can get inside the brass and cause some additional work getting it out .
Let it run for about 2 or so hours. It does a good job of cleaning & ploishing cases.

Don't use anything with ammonia in it !!