I recently got a 1954 $20 note in EF condition, nice note, except it had a teller's counting pencil mark on it. I didn't want to damage the note, so I thought I might try using poster putty to remove the mark. It's the white/grey poster putty you buy for a couple of bucks at any department store or office supply store. I just kneeded a small amount of putty until it became warm and soft, then I pressed it onto the bill and lifted it off. I did this a few times until the pencil mark basically lifted right out of the paper. Result, no damage to bill, or fading of ink, pencil mark completely gone. Cool I thought. Has anybody else tried this? I just know somebody is going to flame me for tampering with the bill, reducing it's value or something like that. But as far as I know, the bill doesn't appear damaged, even looking through a loop.