I have been wet tumbling since the mid 90’s, started with steel shot then went to ceramic. The best additive I’ve used was cabelas tumble bright. When that disappeared I used other concoctions that were just ok. Then found Frankford Arsenal cleaner and it worked well, but not as good as the tumble bright did on BP cases. A friend recommended Shooter 2 cleaner and it works great, much better than the other alternatives for me. A little goes a long way, but you can’t use it for nickel plated cases.
Cheers,
Steve