I've been delabeling a lot of 12 ouncers lately. I put a small amount of generic oxy clean in a pint glass, a little bit of water, and the 12 ouncers slide right in. The good thing about the tight fit is that it insures that the oxy clean will come into complete contact with the label. I let it sit there for a while and forget about it (usually until the next morning) and then rinse off any residual adhesive.
I've also removed and saved many labels this way, you just have to take them out of the water as soon as they release themselves from the bottle.
I've also removed and saved many labels this way, you just have to take them out of the water as soon as they release themselves from the bottle.