For BP revolvers, I remove the grips, pull the cylinder and remove the nipples and yes it goes in the diswasher. I started pulling the nipples after a little rust made removing a damaged one a chore. The nipples are just soaked in soapy water and cleaned with a pipe cleaner. After the "dry" cycle let it cool down and lube and reassemble. All total, maybe ten or fifteen minutes or work, and most of that's making sure the nipples are clean.