The decals on the Lightspeed fork on my Quantana Roo are clear coated over the them. I do not think WD40 is going to do anything. I would not ues any solvent as it may attack the CF. Sanding with 600 or higher wet automotive paper to remove the clear coat will get you access to the decal. Not sure how to remove it,others may have ideas. Then you could re-clear coat the whole thing.