Well if you remove the scribbled ink, you're going to be removing the ink below it, too. Maybe the person didn't want you to reply because they scribbled on it? Probably the best thing to do is a thorough google search about damaged paper restoration on sites that teach how to remove damage from books, etc. or see if you can find a local book restoration in your area. You could also try local stationary stores and see if they have any ideas of how or where. Hope this is of help.
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