I had trouble with my exterior door switches not working properly and found several videos on youtube that explained how to remove them and clean them.  I did so and both doors worked a lot better.  I did not find any videos about cleaning the interior door switch.  So I pried them out with a small screwdriver removed them and decided to try and clean them too.

I used a small screwdriver to pry them apart in the location shown below.

This is what they looked like when I pried them apart.  I cleaned the contact switches on the blue rubber membrane with 90% alcohol.  Then I cleaned the matching contacts on the small plastic circuit board with  the little light bulb on it.  Put everything back together and they worked much better.  I did not need to purchase new replacement switches from Chevrolet for $40.

This is very good info. Thank you for sharing it! With you permission, I'd like to add it to our C6 How-Tos section. 

No problem.  Add it! That’s how I learned about fixing the outside door button was from other’s experiences on youtube.