Hardware Dodgy A button on O3DS

[Zeroba]

I have an old 3DS that has been sitting in a drawer for awhile. I noticed it works pretty much perfectly, other than the A button takes a bit more force than I'd like for it to register.
Think this'll clear up via use, or should I take it apart and clean it?
Also if anyone has taken a 3DS apart before, how bad is it getting to the face button contacts and nothing else?

 

[OuHiroshi]

Some rubbing alcohol on the rubber pads under the buttons will probably clean up the contacts.