Remove vinyl wrap leftover glue?

[mckobe]

Picked up a car today that was vinyl wrapped. The owner removed it, but there were some leftovers which i easily removed with goo gone and a rubber razor blade. On certain parts of the car such as the fenders and front bumper, there is some left over glue, that's hard. This stuff really dried up. It was taking forever with the goo gone and blade. Didn't have my heat gun on me. Is there anything i should try to remove it' It's yellowish on a white car

 

[Eldorado2k]

Rapid Remover.