I stopped reloading for several years and just built a bench and started loading again and noticed I left a decent amount in the tumbler for years using a lyman turbo tumbler walnut media and it liked stained the brass with media all over it inside and out. I tried to tumble it for several hours and it never cleaned up at all. I am not sure if I wasted all this brass or if there is a way to clean it. Thought about hot water and soap in the sink to see what happens.