Anti-Fog Solutions: Spray vs. Goggles - Effectiveness & Longevity

Question
Does anti-fog spray work?  If so, what's in it?  

Do anti-fog goggles work?  If so, does the anti-fogging "agent" wear off?  If so, after how long?

Thanks,
Jeff

Answer
Hello Jeff!
I have honestly never used the anti-fog spray, just good old fashioned spit always did the trick for me; however, I did use anti-fog goggles. Those work very well from my experience and should last you a couple years if you rinse them off after ever swim. The only goggles I'll use are speedo vanquishers, you may want to take a look at those. Hope my advice helped.
-Jessica