You might try one of the 232,000 answers on Google :)

Here is a link that might be useful: White Out

I'd try white vinegar. I think white out is like paint and that's what I used to clean spatters after I painted my kitchen. Good luck.

From their site:

Here is a link that might be useful: Witeout

thanks. I ended up using WD40, and it worked pretty well.

wow.. I never would have thought of using WD40...that's such a brilliant idea. I was going to mention the things you should definitely NOT try... like nail polish remover, glue solvents and paint thinners. Only because I'm not very smart and I have tried them before... regretfully.

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