I had the same thing happen to mine after I put my fermentor in a bath tub filled with water. The little color stripes turned gray and looked ruined. I transfered the beer a couple weeks ago and figured I'd just buy a new fermometer. Just took a look at it after seeing this thread. I still have a couple spots that look grey, but most of it is back to normal.  It looks like it's reading the temperature correctly, so I guess it'll be ok.
Put your fermentor somewhere dry for a while and it may fix it. Worst case they don't cost much to replace.
Terje
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Primary: Burned Mead
Secondary: Bourbon Barrel Porter
Bottled: More Bourbon Barrel Porter, New Pekin Common, Flat Tail Old Ale, Bad Monkey Banana Wine, Flanders Red, Pumpkin Ale
Drinking: Too Much
On deck: Something crazy to use up the 3+ pounds of hops sitting in my freezer
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