bought a 2001 katana from a lady that had some paint work done. There is an airbrushed drawing on the fuel tank that I actually like and will keep but the rest of the bike has some pink outlines. It looks like it was painted on top of the original paint without any prep and it looks like its been done with a brush. How can I remove this without sanding it down or is there any product out there that will get it off without damaging the factory paint?