If you are just trying to remove the labels for a collection of sorts I recommend using 3" wide clear tape (or laminate) and apply it to the label. Rub in hard to get it to adhere good.
When you peel off the tape the top layer of the paper will separate from the glued part (on the glass) and you can remove the top layer without any problems.
This is what I do to get the labels off of the White Labs vials. The glued part comes off with Goop Off.