Steering wheel buttons in manufacturing phase have been covered with soft feel coating.
However, when worn the soft feel coating is dissolving away and creates a sticky film on the buttons.
A simple fix is to scrape off the sticky residue using finger nails.
This will leave a nice smooth button.
There is a subtle color tone change after the sticky layer is taken off, but it is barely noticeable.
Sticky buttons.
After cleaned.
There have been reports that "Goo Gone" is helpful for removing the coating.
However, better try to avoid using solvents, because it is easy to scratch off the original paint also.
It helps to leave the buttons in soap water (e.g., Fairy Washing Up Liquid) overnight. This will make scratching off the sticky part easier.
Buttons in soap water.
Note: Don't try to clean the plastic frame to which the buttons attach. The color layer there is much thinner and too easily comes off along with the sticky coating.