[Mondaveo]

Not steering wheel, but I had success resurrecting my passenger seat heater control button with a few squirts of electronic contact cleaner into the gaps in the trim, after it stopped working last year.
Being situated adjacent to the cupholders, the seat heater buttons are prone to getting splashed by any spills from your beverage, which I guess is what happened to mine to cause it stop responding. Fortunately it came good and so far I haven't had to go further with tearing apart the interior of the car to try to get at it.