There should still be tons of yeast in there, blow-off is mostly proteins and that sort of thing. I'd just wait until the fermentation's done, then dump the yeast/trub mixture and wash it like you normally would. Alternately, you could (in the future, with excellent sanitation) put the wort in without pitching the yeast, let the trub settle, then dump the trub, then pitch the yeast. After that you could just dump the yeast and need minimal, if any, washing to harvest. Your sanitation would have to be immaculate though, as you'd have un-inoculated wort witting out.
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