Under Door Viewing Prism How Do I Get Ink Off My Car?

How do I get ink off my car? - under door viewing prism

For example, a friend of a friend decided it would be interesting to write in my rear view mirror. No problem, went with the resolution of nail polish. However, there was an important line of ink on the side of my car door in the mirror. I have used, the dissolution of enamel in the scheme as well, but I find myself with a faded and ink line. How can I lose?