Removing paint from crevices

I made a toy gun from a broken window shade once. You would wind the spring all the way up. then push the homemade trigger to release it, and a small rock. It would send the rock about 40 to 50 feet, and hurt like hell to get hit. I left a lot of bruises on a couple neighborhood bullies. They would be so busy laughing at the way it looked, that you could get a couple feet from them. Then you just waited till they reached for it, and let them hit the trigger. :)