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My 2011 GL had the infamous sticky switch panel. I thought the previous owner had glued something to it. Turns out this is a common problem caused by the breakdown of the soft touch coating. Mine was pretty sticky and looked it. I used a little bit of Goof Off (essentially the same thing as Goo Gone) on a microfiber cloth. The stickiness came right off and did not affect the labeling at all. This was just about the only actually easy repair/upgrade I have done on the GL.
A few weeks ago I noticed the black panel around the headlight switch on my '08 E350 had become very sticky to the touch. I applied Goo Gone to the panel and the gunky coating slowly broke down enough to use a microfiber cloth to rub/wipe it off. Took about 30 minutes of several repeat applications of Goo Gone and light-to-moderate pressure wiping, but eventually it removed all the sticky gunk. All clean and smooth now and the various symbols around the headlight switch look fine.
Either your switch panel was super-sticky or Goof Off works a lot better. Or maybe it's the age. I used Goof Off on my 2011 GL sticky panel and the sticky wiped right off. In any case, it appears safe to use Goof Off or Goo Gone to do this. And there are replacement panels available on-line for a reasonable price, if one prefers new versus cleaned.
I had thought the "doofus" who owned the vehicle before me has glued something on the panel. Turns out, this goo is the remnants of a soft-touch coating. Apparently, this coating is known to break down over time.
Had to do something similar to mine as well. Wonder what they used there that becomes like old glue...
It was the soft touch coating, that many car manufacturers applied to the plastics, to give a softer feel when touched.
Then years later the coating became sticky, hence the term sticky buttons.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.