I friend of mine asked me to ride his motorcycle for a couple of days because he has been unable to. While backing into my garage, it rubbed against the side of my garage and I got some white paint transfer on his black hard bags. They are plastic. I was wondering what I could use to get the paint off without harming the black paint or plastic. I have tried Plexus plastic cleaner and a Mr. Clean majic eraser, but neither of them helped. Any advise would be great. Thanks.