I started off using PBW, then after reading a few posts here I tried a tub of Oxy Clean Free. I've been a convert ever since - cheaper, easier to get (LHBS is about a 40 minute drive away, Walmart is 5 minutes from work), and does at least as good a job as the PBW.
With either one, I've never had a fermenter so soiled with krausen residue that an overnight soak with a warm solution of PBW or OxyClean hasn't left me with a squeaky clean fermenter.
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