Removing Label Stains (Glue Gum) From Post Cards

Is there a method/or solution that will remove "most/all" of the label gum from an old post card? The label was removed with the hot air of a hair dryer.
Or, Any other suggestions?

Perhaps Ronsonol lighter fluid?

Not much you can do to remove the thin "this side of card is for address only".

I am fairly certain that there is no practical or safe method for removing this residue. On sealed surfaces, it can be soaked, abraded, scraped, or peeled off. On porous materials, such as paper, card, or cardboard, it has gone into the material.

Never believe vendors when they tell you there is "safe" or archival self-adhesive materials.

Fingernail polish remover carefully applied with a q-tip removed the tape stains on this cover.

Great job littleriverphil! That is impressive.

Self adhesives and paper surfaces (absorbency) vary quite a bit, but the nail polish on q-tip method was very effective here. You proved that there are times when this works, and I know I will need to try this in the future. Thanks.

I assume that littleriverphil used an acetone nail polish remover, this would work well on adhesive. But be aware that there is also a non-acetone nail polish remover which I think is mostly isopropyl alcohol and ethyl acetate. This is probably not as effective as the acetone nail polish remover. Easy to tell apart, you can smell the difference.
Don

Also, Phil's cover's tape residue was the very old kind that was basically a simple glue and not a modern adhesive that is on the postcard at the start of this thread. One possibility that might help, or help a bit, and won't likely cause damage is a product called "Bestine" that you can find on line or in some larger craft supply stores. It is a heptane based solvent and is the one recommended by the American Philatelic society for cleanly lifting self stick postage stamps off of envelopes and cards. As this card has no commercial value it is the sort of thing that you can have fun experimenting on to see what works best for this particular adhesive. Also, if you ever want to go back to that seller and buy more things from them in the future you might try to educate them on how destructive their putting such a label directly on a card or cover really is and how it ruins the items value. Suggest to them that they get some inexpensive plastic postcard and cover sleeves and they can stick all of the labels on the plastic sleeve that their hearts desire without ruining the value of the card or cover.

Don is correct, it was an acetone polish remover, use in ventilated areas only!. It will also remove Lineco Document repair tape which is what led me to try it on the old scotch tape. Key word here is Carefully!

Would plain old acetone work as well for that old tape residue?

I wonder how many other items that dealer ruined that way.

For starters, don't use a hair dryer. It melts the adhesive into the fibers of the card and makes the situation worse that where you began. The solvents mentioned are the way to go.