Bought this note on eBay sometime back, it was a little undervalued and ONLY the FRONT was scanned. When it arrived I discovered why (see scan), becausre of the condition I paid well more than the value it was worth. He ended up giving a partial refund, and I kept the note. Because of things like these I am really cautious of eBay sellers.

Non disclosed Graffiti on the back

Like Dick said Nail polish remover (Acetone) should do it .... VERY CAREFULY!!!!!