Remove superglue from the XBox Gamepad. As?

So, I wanted to glue my right DPad together as it is slowly falling apart, but how bullish as I'm I used a bit too much and dropped something on the "back" button. Now he is permanently pressed and do not know how to remove it. Nail polish remover did not work.

Since the glue with the plastic "verfrisst" You can grind the gap zw. Knob and housing only "free scratching" or with a small cutting disc (Hobby drill / runner)