The Apple instructions are to just use a dampened cloth. I actually have been using a screen cleaner called iKlear that I use to clean my mac's screen as well as my iPad and phone. I just spray a little bit on a cloth and wipe it across the band, front and back. It works pretty well and I've not seen any discoloration of the band. I also use that to clean the screen as well as the sensors on back when I've been sweating a lot.