as my radio knobs have been "sticky" for some time, i'll try the goo gone method.I just want to follow up on a solution for the sticky radio knobs on the CDR-24. I ended up cleaning them (as suggested by tach miami and jaica), as opposed to dipping them in plastic-dip per the do-it-yourself projects documented by Pedro's Garage.
I pulled both knobs off—use a firm and even motion to do so—in order to better clean them. At first I tried using a relatively mild cleaner, namely, Method Floor and Surface cleaner. Even using the product at full strength applied to a microfiber towel, all it did was push the sticky goo around the knobs—it did nothing to remove it. I then applied some Goo Gone to a microfiber towel and began wiping the knobs. This was the ticket, as I was able to remove the sticky mess from the knobs and return them to essentially their original condition. It took some effort to fully clean the knobs up with the Goo Gone, but it did work. No damage occurred to the knobs either.
On a side note, my AC and fan controls were peeling, so the dealer replaced the entire unit under warranty. The cleaned up radio knobs feel about the same as the updated AC and fan control knobs.