Just lick the outside lens cover! Actually, lick-it twice. This will put a thin layer of saliva over the housing and water will bead off. If you notice a bead of water on the lens cover, lick-it again. You can buy product that will do something similar and sure they work well, but if you find yourself out there and want to make sure you #DontMissTheShot – Just LICK YOUR GoPro, VIRB or other Action Camera LENS!