The reason for the post is because I was looking for a little guidance and advice. I've never done any "doctoring/cleaning" of any cards and was a bit paranoid that:
1 - I'd be violating some type of code of ethics
2 - I'd destroy a paper item which I can't replace
Thank you guys for the advice and guidance. You can see the difference in the card before/after. Note, I didn't scan the before image, I found it from a web site and used it as my reference as "before". You can see the "cleaned" image on the right. Q-tip and water and gentle scrubbing removed a lot of dirt and crud.
Thanks again!