I hesitate to post this because it is probably obvious to all of you, just not to me. I have had my two 7.9 gallon fermenters for about a year and I must have put 15 batches through each one. I just finished a batch of Carmenere and one of Riesling so I thought I would really "GI" the fermenters this time. I disassembled the spigots to clean them and, I mean, Funky Town! I soaked them in hot water and OxyClean while I cleaned out the opening in the fermenter and now they are clean as a whistle (however clean a whistle can be). I always did a superficial cleaning with OxyClean, but did not disassemble them. I will put that in my routine from now on. Probably preaching to the choir here.