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As a homebrewer, this is definitely one of the most tedious, and laborious tasks. I've tried this and found it will work with some labels, but not all of them. What I have found works well, uses far less water, doesn't require using hot water (saving energy) and is pretty effortless is this:1. Rinse your bottles out as soon after you drink them as possible.2. I keep a 5 gallon pail of water with a little oxy-clean in my garage (with all my brew equip). Drop your bottles in to soak. A lot of them fall off on their own, or peel easily, leaving a bit of glue residue behind.3. Empty the bottles into the pail, then rinse with clean water. 4. Remove any glue residue with a blue scotchbrite scrubber, before the bottle dries.5. Refresh the water and oxy-clean periodically.
I forgot to mention, I usually leave them overnight. That's typically plenty of time.
How to completely refill a 1lb "disposable" propane Bottle