As mentioned, it looks like glue residue which is a bit more risky to remove. You will need alot of patience (and let me emphasis the "ALOT" part) to get the glue off. Water alone will probably not get the job done, you will need some sort of a Q-tip to gently get the glue off. Doable......yes. Worth it, I'm not sure. You will probably end-up with a few tiny tiny specks of paper loss, even if done correctly. Thus, if your goal is a nicer eye appeal T206 Chase that will still grade a "one" irregardless.......then okay, go for it. You will not harm the card by soaking it a second or third time (the soaking part won't hurt the card, but it's the part where you try to remove the glue residue/paper that could damage the back). If your goal is a higher grade, best leave it in the holder and just make sure to look at the card facing-up.
Lovely Day...
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