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One way to tell is if you run the lenses under water. if the hydrophobic coating is still good you should see the water just run right off or at least bead up (like a freshly polished paint finish).
I clean every single pair of used glasses I buy with warm water and mild liquid soap. The lenses that are coated will do just as i said, from my observation. The ones that don't, I'll clean thoroughly and apply hydrophobic solution to and they're good to go.
AFAIK, the hydrophobic coating is something that needs routine maintenance, if you plan on using your Water Jackets outdoors. Like the others said, buy yourself a kit from the O store and you can use it multiple times. You'll love the WJ's...it's an awesome outdoor activities sports frame.