WD40 is made of:Amfoto1 said:WD40 is fish oil, I think. At any rate it's pretty mild. So, yes, it should be fine so long as you wash it off with a mild soap afterward. I've used it to remove handlebar tape glue from carbon bars without any problems.
Still, I think Goo Gone is orange oil and it's probably the safest thing to use. I'd still wash it off afterward.
50%: Stoddard solvent (i.e., mineral spirits -- primarily hexane, somewhat similar to kerosene)
25%: Liquified petroleum gas (presumably as a propellant; carbon dioxide is now used instead to reduce WD-40's considerable flammability)
15+%: Mineral oil (light lubricating oil)
10-%: Inert ingredients