If you have access to an air compressor. Use a stripe erraser. It will not harm the paint. Auto body techs use it on a daily basis for when blending paint onto adjacent panels. Your local paint store should be able to accommodate your item.
Mark
Ya they work like a champ. I still remember the first time I used one. It was on a BMW no less. Sure didn't seem like a good idea to me but they really do work!!