Just did 6 cases yesterday. Even though I enjoy bottling, one of my least favorite parts of this hobby is delabeling and scrubbing bottles! I use a large utility tub, fill it with bottles, toss a couple scoops of generic oxiclean in, and fill with hot water. I try to fill as many bottles as possible while the tub fills and poke down the ones that pop up. Then let them sit for at least an hour. Some labels fall right off, some have to be scraped off. Some have almost no glue left, others are covered in a thick film and have to be scrubbed. I keep a plastic scraper, a plastic scrubber (like plastic steel wool for nonstick pans), and a bottle brush on hand. Every bottle gets the brush even though I rinse meticulously before storing. Even if the label comes right off, you have to use the scrubby to get the glue residue off. I toss the tough ones back in and deal with them last so I don't have a bunch of paper floating around. Use the plastic scraper over a trash can to get as much of the paper off as possible then scrub the rest off. I then dump the dirty soak water (through a strainer if there is a lot of paper) and rinse every bottle inside and out. Now they are ready to be sanitized. I use my dishwasher set as hot as I can get it and that has always worked for me. I have a batch of bottles sitting in mine right now that I ran through last night waiting on me to fill em up! I even run them through the dishwasher, let them dry, put them back in the case, and throw foil on them to keep creepy crawlies out until bottling day.