How to get ink off an iPhone case?

I have a Hello Kitty iPhone hard case and somebody that I let see my phone I guess had ink on her hands and now my brand new Hello Kitty case (just got it yesterday) has blue ink on it. How do I get the ink off?

What about a high-polymer pencil eraser?

A Mr. Clean Magic Eraser may work

Remove your phone from its case
And use rubbing alcohol
This will remove ink

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