Labels come in two types, Pressure and gum. The gum ones come off in water, the pressure adhesives don't.
Really hot water will soften the glue, I have had a fair bit of success using the steam wand on the coffee maker.
Give the label a good blast and they often peel of very easily.
A bit of a solvent (Acetone is great) removes any residue of adhesive very quickly.
Mark
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