Use what pros using this will not do damage to paint or clear coat
3M General Purpose Adhesive Cleaner Quart 08984
Should be around 14$ at your local Home Depot but not all stores carry it.
If not take to any print shop or shop that dose car wraps they might sell it to you or offer you to remove it. Job is pretty easy wipe and go so don't let them rip you off!
And for the record if you removing any type of vinyl (clear bra) use heat gun or your girlfriends fan lightly heating up area that you trying to remove it will make the job a breez.