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runscottI used to soak cards, and this works fine for t206's; however, the writing on the backs of t205's tends to come off in spots.
So now I dip a cloth into lukewarm water and dab it on the glue/paper residue areas until I estimate that the affected area is soaked through just past the surface of the card. I then rub gently with the cloth on the affected area only, re-wetting if necessary. I have also done this to the backs of photographs to remove residue - since I didn't want to soak the entire photo.
I also recommend typing paper over paper towels. After pressing the card between typing paper several times by hand, until you've removed all surface moisture, place between typing paper, stick it in a book you don't care too much about, then wedge the book tightly between other books on a book shelf, and let it stay there for a day or two.