On plastic, there are few options that will remove the stripe without altering the underlying paint. You may get lucky with Testors Easy Lift off. In most cases it will lift the lettering or in this case the stripe well before it begins to attack the underlying paint. What differs from car to car is how much of the residue can be removed without leaving a stain. Its worth a try. I would try to have a good match for the underlying paint in any case as odds some touch up may be required either to fix the sanding marks or the residue.
Pete
