Bill, you are not going to have success soaking in water to get rid of a tape stain. Water is a solvent, but not everything is soluble in water--tape adhesive is generally not water soluble...there are other solvents out there that may result in a decent removal of tape adhesive and/or residue but I don't know that you will have much success if the card itself is stained from the adhesive.
Soaking starts getting much trickier when you start looking at 1930/40's to the present. With the introduction of industrial adhesives you will begin to have much less luck with simple water soaking. For example if anything is put in with rubber cement soaking will not do you any good.
-Rhett
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