Posted By:
David SmithI don't know if it will work on T 206 cardboard (but isn't cardboard cardboard?) but you might want to try a Q-Tip and rubbing alcohol.
I have had paper items with tape residue on them (I haven't tried this on a baseball card) and have taken a Q-Tip and dipped it in rubbing alcohol. Then, I took the Q-Tip and slowly (and gently) rubbed it over the tape residue. You might want to try this on your card but in an area with no printing, just in case the alcohol removes the ink.
David