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T206CollectorI don't view removing tape from a card to be an impermissible alteration. I have longed soaked cards in water to remove paper residue (with varying results), and my best work on a T206 cards resides in an SGC 70 holder. I also use art erasers to remove pencil marks. Neither is an alteration in my mind.
I do draw the line at any substance which leaves a trace, either chemical or otherwise. Then you are adding to the card (chemicals) while taking other stuff away (paper, glue, tape, etc.)
I received the cards today, and it appears someone has removed almost all of the tape skin, but ther brown staining from the glue of years gone by remains. I suspect it doesn't make any sense to clean these, but I may try on one or two, with water. I will upgrade my set where possible and then sell them all back on ebay, from whence they came.
Thanks for the tips.