I don't know about washing, either. I salvaged the Wyeast Northwest ale yeast from a spiced ale and used it without residual flavour in a subsequent batch of IPA. I took it off the secondary. I was wondering about it, but didn't detect any spice off-flavours when I pitched it in my starter. I'd say keep it and see what it looks like come next brew day - with the backup of a new Wyeast starter pack in the fridge!
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