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Permanent marker is not easy to get off a car's exterior without damaging the paint. However, there is a product called Stoner Xenit Citrus Cleaner which claims it can do just that. I haven't tried it, so I'd advise doing a little more research on it first.
Use hairspray then use some wax...my 2 year old just drew around my entire new white car! She also got a little on house siding, tool box, leather motorcycle seat and wagon. I would also try an eraser...or one of those mr.clean erasers...havent tried it yet.
magic erasers work real good