How do you get your used parts so clean?

Just posted this on another thread. Clean with solvent, boil at the machine shop, sand blast at my buddies shop, and lot's of scrubbing with simple green, water, and thinner. After 10 years it has stayed pretty good. (I need to snap a "now" picture)View attachment 1715155340 View attachment 1715155343 View attachment 1715155345
I have always liked simple green... good stuff!!