Every time I take my GoPro out... I'm disappointed when I get back home. So many awesome shots ruined by fuzzy blurry salt stain right over the action. How do you keep your lens clean...????
Rinse the lens, spit on it, rub it clean, rinse
Similar to swim goggles. My problem is I keep bumping it and causing the mount angle to change, and not noticing it until way later.
try these i use them on my sailing glasses works a treat , $5 from chemist warehouse
I wear mine on my head ..and every 15 minutes ..i spit on my finger and rub it on the lens ...it works ..
*Warning* the following may disturb sensitive souls...
Similarly to goggles, you need to spit nice and slimy saliva onto the dry lense. Anytime it dries out needs reapplying.
if you have nothing else once out in the water licking it is the best way to get a water bubble or a dried splash off it.
Select to expand quotepowersloshin said..
if all else fails try and pi@@ on it ! 
OooooKaaay! 
But you may not want to lick it afterwards! 
