Palmolive dish washing detergent with citric acid (dishwashing machine granules).
I use a tablespoon of each and dump that into the tumbler with tap hot water as cold water doesn’t work aswell.
I generally tumble for a good 4 hours then rinse, towel dry and leave the cases sitting in a tin foil tray.
A little bit of experimenting and you’ll soon fine what works best for you.
It’s certainly the best method for cleaning brass especially primer pockets!
As for drying I used to put them in the oven on low temperature with the oven door ajar but typically I just leave them by the fire when it’s on or in the sun room for a couple of days before they I start using them.
Bookmarks