You know, it seems to me that the labels either come off very easily (i.e. just hot water and a little dish soap, like DFH labels), or they are going to be a PITA and soaking for days doesn't help. The last time I did a mega-batch, I soaked for a couple days in some ammonia water, and it didn't really seem to help. Those that would come off easy anyway did, and those that weren't coming off needed some assistance (little squirt of WD-40, followed by a VERY thorough washing). So, I'm done with soaking, I take them off as I go.