It might sound crazy, but being true to my Sig Line, put all your cases in a container and cover them with Diet Coke overnight. Drain and rinse the next morning. I usually use a neck brush when rinsing them out. Then put them upside down in a loading block to dry. Clean inside and out for a dollar and just pour it down the drain. They won't be shiny, but they will be totally clean. It's too cheap and easy.
