It's as though the surface layer of the buttons has become tacky and sticky to the touch. All the other switches in the car are OK. Has anyone experienced this problem and how did they get rid of the stickiness?
Give the interior and wheel buttons a good clean. I would suggest baby wipes for the buttons,.
That does work, although you need to scratch all of the button as you leave grime marks. The baby wipes work...
of course, you could get the car professionally cleaned inside.
It may work if the buttons are merely dirty. But if, as happens, the coating is starting to break down, then either scraping or replacing are the only options.