Quote Originally Posted by schup011 View Post
As far as I have heard one can also get the sticky material off with a solvent like alcohol or something similar. Then the knobs don't have the softer rubber surface anymore, but are very ok to use.
I can confirm this. Cleaned them with Bacillol-Wipes (basically alcohol wipes). You have to scrub a bit but then the rubber comes of and a pristine plastic finish is achieved.