Frankfurt arsenal tumbler, there cleaning solution, imagine u can use many products but its cheap, works nicely…Steel pins are easy, just shake any out when you take them out of tumbler, they get a thorough rinse till no bubbles in other words clear water in tumbler and solution is not present. never had a problem its fast, i dry in oven on tray low heat, like 170, 30 minutes or so. I clean every time. Ive hurd Eric Cortina say he tested clean no clean with no difference, he dosnt clean, f class champ etc… i do because i like fresh looking brass, no sharpie marks on any from testing etc.If you go this route i recommend using something like forsters micah powder to inside neck before sizing. Its put on a brush and spun in neck. They sell a tray with different caliber brushes containing powder. If you dont do anything the brass is so clean i believe drag is introduced in ball or mandrel due to brass being do clean, the micah powder dosnt introduce or interfere with dimensional change, nor need to be removed, its there to do its job, providing consistent movement, good luck.