I think that depends on what you mean by "a little while back" and how much yeast you washed. I wash yeast from 5g batches, and end up with 4 jars, none of which contains enough yeast IMHO to brew a new batch. If the little while was more than a couple of weeks, I'd definitely make a starter, but if it was less than 2 weeks, and you collected enough, you may be able to get away without one.
-a.
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