At one point, someone heard me ranting about it and said "hey, you need this stuff called 'goo gone'" and I have been using it ever since. This stuff melts the glue away, and doesn't lose its effectiveness even when you get it wet. I routinely use it to re-purpose Snapple bottles to used for iced coffee and tea.
|Some coffee cooling off, and almost ready to go into the fridge. Nothing but shiny on those Snapple bottles|
A word of caution though: Goo Gone is a heavy duty solvent, and you should make sure to rinse it off clean and not leave it near children or animals. It feels weird when it gets on my hands, but I always make sure to rinse off every trace of it. Also, it goes a long way, so use it sparingly.
Now I don't stress that dreaded tag ripping halfway through taking it off the new toaster, setting in motion an OCD-induced series of events where I must obsessively rub every trace off with just a plain towel.