Yeast washing refers to the process of reusing the yeast from a just completed fermentation.
Once you've finished taking the fermented beer off your yeast cake (either after bottling or transferring to a secondary vessel), you're left with a thick trub consisting of healthy yeast, dead yeast, hop and grain particles. Washing is the process of separating these out and keeping the healthy yeast, ready for re-using in your next brew.
This post on billybrew.com is the best explanation (with video) I've found.
Once you've finished taking the fermented beer off your yeast cake (either after bottling or transferring to a secondary vessel), you're left with a thick trub consisting of healthy yeast, dead yeast, hop and grain particles. Washing is the process of separating these out and keeping the healthy yeast, ready for re-using in your next brew.
This post on billybrew.com is the best explanation (with video) I've found.
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