Hey folks, my friend accidently spilled a little juice on the A button and now once and a while if I don't use it for a day, the button sticks for a few moments. So basically I want to open it up and clean it a bit. What triangular screwdriver can open this controller? I'm assuming this stickyness won't go away unless I clean it out because it's really annoying now, Thanks! Does anyone have any suggestions to clean it somehow?