Maybe I was expecting too much of the cleaner. This morning I took a handful of very dirty once fired 308 cases to work and enlisted the services of one of our VERY attractive Polish assembly operatives to take me through the process with the ultra sonic cleaner.
The cases went through four separate 10 minute cycles with some detergent in the hot water. I was fully expecting the cases to come out shiny bright, as new. I was quite disappointed. The gunge in the primer pockets did come out..eventually, but it would appear, from what Joe Bloggs says, that I still need to use my tumbler.
I was talking to Waldy at work, he was telling me that there are some posts on here about using cheap coke for cleaning. Must do a search. All-in-all an interesting exercise.
Phil