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Yeah bleach bombing it is the next step. I'm gonna be fuming if I make another sour after though hahaNothing but sours FOREVER if you use those plastic fermenters again. It might be possible to save them with a complete disassemble & nuking everything with strong bleach solution for a week or so, but once those nasties are entrenched, no amount of cleaning/sanitising will save them. Keep them for sours only & get new ones for "proper" beers.