"sem solv" is what we used to use to remove adhesive from paint -when i was working at a car dealership. it is safe for paint, well, safer than paint thinner or xylene at least.
BTW -if you ever buy a new car from a dealer and they have to order it from the factory. tell them not to touch it or prep it after it comes off the truck. That way you get a car with no stupid stickers on it. plus it has all of the factory installed protection like plastic seat covers, floor covers, steering wheel, roof, hood... then you get to unwrap your new car like a present plus most dealerships have a bunch of delinquents in the new car prep department -trust me, i was one of them