Easy Off works. Do it outside (fumes bad), spray on liberally, wait ~10 minutes, and rinse off. If all the color is not gone, repeat. Once done, the finish will be kinda blotchy. Simply use some steel wool and clean it up. That's it.
FYI: Some people say Easy off doesn't work depending on the part. It worked for me with the Traxxas Revo chassis and parts.
I've always used EZ-off oven cleaner. Works like a charm. Some lately have used a commercial cleaner/degreaser that I beieve is called Purple Lightning.