Ive read a lot about this and people say to use bleach or dish soap and soak it overnight or wash it in a pants pocket but Im here to tell you what really truly works. Efferdent Guard Cleaner. Thats right Efferdent. Not only does it clean the band but it kills 99.9 % of the bacteria and its skin safe. Do this once a week and you will be happy! Just fill a glass with tap water and detach your watch band from the Apple watch and put it in the water so both sides are below the surface and dump in a single packet. 15 minutes later you get back your watch bands will be clean and fresh smelling! Let me know your results!