You don't have any residue that sticks in there? Or do you run a big rinse at the end?
nope. After tumbling I sift out the pins, then turn The faucet on a drizzle And rinse each piece while simultaneously inspecting for pins. Then its onto the annealer. It doesn't take very much soap to get shiny clean brass. You could probably just run it with nothing and they would come out great but I personally enjoy shiny brass with a nice annealing line. Just one of those things that pleases my brain.
Last summer I did a little clean vs dirty brass test as well as clean vs dirty with a different primer. In both tests there was an ES difference of 2fps and zero accuracy difference. Ill stick to clean brass.