How to clean stuck/slow infotainment console buttons?

I agree, went for the 2015 GT rather than the early 2016 for this reason and there was hardly any passenger armrest with the 2016, plus did not like the blacked out wheels.
 
Hi - I've searched on the forums but can't seem to find any suggestions.
The favorite button is along with the home button in between the two seats are sticking and/or slow.
Anyone have a save way to clean them so they work properly?
Thanks!
Jim
I've been told by Mazda that this is a $800 repair because the switch is not faulty, owner problem from spills. I thick it is a design error. Why have horizontal switches? Asking for trouble. And they see this problem frequently. They should offer repair for free.
 
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