it's probably done the same way you remove any sort of decals that've been clearcoated on. use a small localized amount of the thinner of your choice in the area over and just around the edges of the decal until you get the clearcoat off and then use the standard razorblade or whathaveyou method to peel off the decal once it's been exposed. of course, once you've gotten the decal off, you'll probably want to spraycoat that area to give it another clearcoat.