Originally Posted by Disi
I say, give it a try. In fact, I wouldn't even bother washing - just dump your stout on top of the yeast cake. Judging from own experience, of course. I'm sure more experienced brewers here will chime in with some solid facts and better advice.
That is correct, no need to wash it. Just reuse the cake.
I haven't bought yeast in quite a while. I either reuse cakes or I wash the yeast cakes from my batches. I have 15 or so jars of washed yeast derrived from dry and liquid strains in my fridge. I even have one that I derrived from the sediment on the bottom of a bottle of a commercial beer.
Wash the yeast, save $$ and get higher pitch rates and shorter lag times.