My 2 cents.

REALLY HARD STICKY COMMERCIAL LABELS (I feel these gorgeous bottles are
worth re-cycling)

1) With really hot water- fill the bottle.
2) Let bottle sit for 10 minutes with really hot water inside.
3) Bottle is very hot- peel off label (adhesive remains).
4) Let bottle sit in hot soapy water (very soapy) for 30 minutes.
5) TRICK: Using the side of a wood chisel (mine is 1/2" wide)scrape off
the major adhesive. Side of my chisel is a very square, sharp right angle
and makes a better scraper than anything I have used.
6) After 5 day soak in the soapy water, use the side od the chisel
again. Adhesive scrapes off easily.

Takes about 1.5 hour total for 20 bottles, start to finish.
Works for me.
--
KB
St. Charles, MO