I have had a lot of experience with soaking, but trying to remove something from the back of a card is like having a front row seat to a damage concert. Whereas card fronts have (some of) the protective gloss there to help make something atop it go bye bye, the backs have nothing. That mold is probably there to stay unless some serious chemicals, effort, expense and whatnot are added to the equation, and then, as was stated, it becomes a serious alteration.
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