How to get white out out of plastic?

So my little sister had some white out that she found in the house and decided to cover my iphone case in white out and put her name and covered aeverything actually. Its like plastic ish I think here's the case I have.

http://www.google.com/...0&bih=373#

It's the one with the iPhone Phillips case that has one black/gray color and the other case color is light blue /: Is there any way to get it out? I tried water and scraping it with a tooth pick. Didn't work.

You could try a little wd40 on a rag.

Nail polish remover