I have used Axe cologne spray and it has worked really well.
get a cloth and soak it with gasoline
Put some Dawn on it.
Dial remove permanent marker because it could remove things that would come off a little bit
I would try fingernail polish remover. That will take permanent marker off of almost anything.
Try Isopropyl (rubbing) alcohol. Not just for hair... I don't know if this works on leather or not, but I've used hairspray to remove permanent black marker from a crushed velvet sofa. (I wonder if it's the alcohol in it?)
bleach or hard scrubbing um, try this, put dry erase marker on top of the permanent marker and erase it with a tissue
Use a product called Goof-off or Deep Woods Off (insect repellant) to remove it.
Try deep woods off insect repellant. It will remove permanent marker off of most anything, remove fingernail polish and works on mosquitoes as well. It works. Ive tried it.
Possibly, depends what base the marker ink is. If not, try Goof Off, it's a bit different.
I have found nothing to get permanent marker off of anything. That is why it is called permanent. It stays.
Just wait a while and keep on washing your hands. The dead skin cells on your hands will come off and take the permanent marker with them. What does this have to do with cars and vehicles anyway?
Not coming off