Posted By:
PaulI read an article long ago that said tape and tape stains could be removed by soaking the card in the chemical toluene. The author of the article stressed that he had tried this only on 52 Bowmans, but that it worked well.
I have tried it only on a 64 Topps card. I was afraid to soak the whole thing, so I soaked only the corners where the tape was. I believe I used a Q-tip to try to "encourage" the tape to come off. It did, along with some of the ink. So, I can't say that I recommend this procedure, but, if you have a lot of low value cards to experiment on, you may want to give it a try. Maybe if you have more patience than me and don't push the tape off with a Q-tip, you will have more luck.
You should be able to find toluene in hardware stores, although I remember searching a fair amount for it.