try a cigarette lighter just hold it so the flame does not touch the plexi-glass it is really easy it may not be the best because if you are in a hurry it turns it black and you have to wipe it off and sometimes it does not come off totally but i was trying to make a 90 degree angle so just to curve it to fit your mouse would be easy. I've tryed hair dryer, a little heat and even a propane torch but the lighter has the best results. Just make sure you you do not stop moving the lighter or it will make like little bubbles come up. hope this helps
