I've used a homemade tumbler that I got from my Dad for years, and I finally got a new one from Midway for Christmas. I am mainly concerned with cleaning the brass, not so much in making it look shiny and new. I've always been leery of adding chemicals to the media, as I don't want any residue in or on my cases. I know it must be safe, or reputable manafacturers and retailers wouldn't offer it. How many of you add polish to yur media, and if so, do you worry about removing it before loading the cases? Thanks!