Fill inside plastic bottle with really hot water and let sit for a few minutes. The glue will loosen and the label can be peeled off effortlessly. If really tough- retry and let sit a little longer. I use this method all the time and 99% of labels will come off with little effort.
By
01/11/2010
Use your hairdryer, it will soften the glue without hurting the label. Just start lifting from one corner slowly as the glue melts.
By
01/11/2010
Soaking a label with white vinegar usually will loosen the glue.