Big water drops on GoPro, Drift, Contour type cameras spoil your videos - there are solutions!

While it's not the most exciting video in the world you do see the water drop problem. Some people use Rain-X and that may be fine, but if you are out there without it a good lick can help.  No harmful chemicals either (not that I know what's in Rain-X, it's probably absolutely safe). An old trick I used when my windscreen wipers failed once in Scotland is to use a potato  cut in half and smeared on the lens (or your windscreen) - although you may not have a ready supply of potatoes in your pocket. Still, now you're warned I'm sure you'll take a few just in case. Someone also suggested using wax and polishing carefully to create a low friction coating on the lens. Take care in sand!
Licking seems the safest bet and if you can't lick the lens, just drop it in the water a few times and enjoy the visual effects as water runs off at speed.