I lube rifle cartridge cases with a pad and whatever the RCBS stuff you squirt on it is called. And, per the book, I lube the inside of the neck.
I've tried all sorts of ways to get it off.
Most recently, I used the vibrating tumbler with water once with dish washing soap and water and once with just water (to get the soap off). Then I heated the brass on the stove to get it dry.
It worked fine. Took 20 minutes and the brass is clean.
Only bad thing is having to wait for my wife to go out so I can steal her stove and a pot.