USSR
Member
I have purchased cases wet tumbled with stainless steel pins, Lemishine and Dawn for four hours from Aardvarkreloading.com (https://www.youtube.com/watch?v=A45HdldSxxo). While clean and shiny, it was no more clean and was actually less shiny than the cases soaked in vinegar for 30 minutes and then tumbled in walnut media for 4 hours.
Then either Aardvark doesn't know what the heck he's doing, or you have found the source of magic crushed walnut shells. I processed brass commercially for several years, and no dry tumbling method could hold a candle to the results obtained with wet tumbling.
Don