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Sean BHI don't think I would try goo-gone, it might bleed through the card and eat the signature. If the signature is ink, I would think dabbing some water on there would work best, and probably not affect the signature.
I'd be nervous!
Edited to add: I had a T206 Cobb with the name "Carl" written in fountain ink and I tried to get it off with a q-tip and water but nothing happened to the name.