Hi Jeanne, if all you're seeing is gray hooch on top, then I definitely think it's worth a shot! I would start feeding one of your starters with twice a day feedings according to our sourdough maintenance routine, and if you're lucky the starter should start rising predictably within a few days. Check out part 2 of this blog series with some visuals on how to revive a neglected starter. 

I hope this helps! Let us know how it goes. 

Barb

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