As others have said there's no hope for those vintage cards. If you want to see for yourself, test it out by grabbing a common 80s Topps card, scribble on it in Sharpie and then try to remove the ink.
With older cards that have no glossy surface, the ink actually bonds with the fibers of the card (think of it like getting a stain on clothes that won't come out) and makes it impossible to remove without damaging the card's surface. With glossy cards of today, the ink never actually bonds with the material of the card. The gloss acts as a barrier between the ink and the card itself, so the ink rests on the top so to speak, which makes it very easy to remove with a dab of rubbing alcohol, an eraser or sometimes even just your finger.
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