I clean my fermenter with PBW or B-Bright, using hot water and soaking for an hour or two. When I'm done with the fermenter the solution goes into a cleaning bucket and in go any unlabeled bottles that need cleaning for a good soak. After I'm done with the unlabeled bottles any labeled ones go in for a 6-12 hour soak, the lables come right off... if they don't the bottles go into the recycle bin. I can usually delable several cases of bottles before the cleaner gets dirty enough to make me stop. Works for me.