Posted By:
Frank WakefieldIt would be doctoring on the remnants of the attached material...
Give the card a bath. Run some tap water in a glass, hold the card under the tap water as it gently runs, then immerse the card into the glass. Wait a few hours. Rinse. Gently blot dry, then place between paper sheets and a stack of books. Change the paper a time or two.
The card is already severely 'doctored' with the trim job it's received. This soaking won't add to the card or change the card, it will change / remove the foreign material that has adhered to it.