On mine only the volume switch was particularly sticky, presumably because it was used most. The buttons have a "soft feel" coating. I used my finger nails to completely remove the coating. There has been no colour ( UK spelling ) change and the button looks as it did before but now feels much nicer. I don't like these coatings, especially on a second hand car; you're never quite sure who used it previously!!!!Thanks, all.
Ours is light grey also. And, yes - cleaning off the dye will bug me too. I'll try rubbing alcohol and a qtip and let y'all know.
I plan to order the leathertique kit with tough up dye also - for the interior in general. Maybe the dye would work on the buttons? We'll see.