Disclaimer - other anti-fog solutions are available, but this is the one I use
Gob when dry, washing up liquid, different goggles and repeat, all with a rinse after, anything else detergent based,
Swim goggle demister contains detergent. You get the same effect if you lightly rub/smear a little soap or washing up liquid around the lenses, then rinse thoroughly.I always put some detergent in my goggles before swimming, usually use the hand dispenser at the pool.
you'll also find that it's more common when the water's very cold as now. the temperature difference between your face and the water is pretty large and this makes misting up easier. think of it being like a foggy morning - cold air, lots of moisture, temperature difference between land and air - result, fog.
I use detergent as well to reduce it happening
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