[Exhibitman]

I used Un-do recently. It is not a cure-all. It will release recent pressure labels, like the bar code labels that those idiots at the Tribune Archive slap onto every old photo they sell. It does leave a glue residue. I've tried it on some early scrapbook-glued items and it did not work.

if you are just looking to sell them, why take them off at all? Leave that to the buyers.