Well done, Jim. And thank you for the "Results".
Thoughts to consider:
Soaking that card, the entire card, would be safe because the card isn't going to instantly disolve, the card is porous, and the glue isn't just on the surface of the back, a bit is likely to have soaked in... so soaking the entire card lets that 'inside' glue migrate out while immersed in water.
Q-Tips... Q-Tips are fine, but if a longer soaking (10 minutes is very short soak) allows the glue to release, then let soaking do more of the work and you can minimize the Q-Tip scrubbing.
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