Just tried the Vinyl Off. It works great!
(Maybe not as great as they claim, but better than anything else I have ever tried)
. I also got some of their adhesive remover. It also works great. It is almost as good as the 3M adhesive remover but is cheaper and bio-degradeable.
I was even able to remove vinyl letters that were on top of my vinyl stripe with no problems. When I tried to remove them previously, it was impossible to get the two vinyls to separate.
I highly recommend!