Nothing like reviving an old thread! First, I'd like to thank Dave for posting a detailed explanation. I didn't realize there were two layers to the button when I was dong this.
The only thing I'd like to add is that the solution could all be done literally for FREE! Admittedly isopropyl alcohol is pretty cheap but if you didn't have any, this is the way to go.
1. I pulled off the knobs by using my fingers to grab all sides of the knob and pulled the knob straight out. It took little effort. The reason I add this comment is because when I was researching buying new knobs, I found the following statement on one of the vendor's site:
Note: Professional installation recommended. Risk of damaged to the CDR 24 is possible when removing the control knob with an incorrect force or tool, and damaged to the circuit board is possible if too much force is used during the installation.
Don't let this scare you! It's really easy.
2. With the knobs off, I just used my thumb and started rubbing off the secondary rubber coating. You can use a wet cloth to remove the sticky stuff off your thumb. Otherwise you'll just end up spreading it back on the knob. It took all about 15 minutes if that. Just be careful not to use your nails. Stickiness is all gone.
I hopes this helps others that have this problem. Unfortunately, I don't have a before picture but this is the after.
