There are a few ways to clean sticky buttons in a car.
One way is to use a cotton swab or toothpick to lightly scrape the dirt and grime off of the buttons.
Another way is to use a mild soap and water solution to clean the buttons.
You can also use a commercial button cleaner to clean the buttons.
https://howtospoint.com/how-to-clean-sticky-buttons-in-car-2/