I know HF is the recommended treatment, but I think I might like something a little less problematic around the place to do it. I've seen some suggestions of 0.5M sodium fluoride + 0.5M ammonium persulphate, but I'm not sure that that's all that much better; it'll still attack glass (particularly as it's used at heat). Tumble polishing with abrasive media - fine, but surely you're going to get oxidation forming quite rapidly, especially if it's in a wet medium?

Any suggestions?