I took the badge off and there is nice original ivory paint underneath... What do you guys think is the best way to get the blue off? Paint stripper, Steel wool, paint thinner?
Paint stripper will kill everything. The success of taking it back to the original paint depends on the type of paint that it is. Some people have had amazing results with EZ-off over cleaner. It seems to be about 50/50. I don't know which type comes off best, be it lacquer, enamel, latex, acrylic, etc. Goof off works to a degree for stubborn stuff but will take original paint too. Same with steel wool. Heat guns can also help loosen or even bubble certain types of paint without hurting the original finish.
I'd try the oven cleaner first. It attacks original stuff the least in my experience.