Try a product called Ink Away, you can get it at most office supply stores. It works great getting ink out of almost everything. It is a big winner in my house since my kids like Sharpe pens!
You could always cover it with shoe polish or liquid paper if the blinds are wooden. If they are the vinyl kind, you should be able to remove that slat and take one from the bottom and replace it.
I have removed permanent marker from photos, varnished wooden floors, and linoleum with a product called SolUMel. Another person told me of her success removing green marker from a bedspread with the same. email cartonv2@juno.com
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