This trick has worked for me every time; Take a piece of paper towel and fold it over on itself so that you have two layers. Saturate it with 30% heli or car fuel. Place it over the boo-boo. After an hour or so, attempt to wipe off the CA with the paper towel/fuel. Keep doing this until you get the last of the CA off. It will take multiple applications. If you catch it right away, it will come off much quicker than if you let the CA cure for days. Occasionally the fuel will cloud the canopy a bit. Just polish it with a soft wet rag and toothpaste. Good luck!