Riding a motorcycle in the rain can be challenging, but being prepared makes it easier before the rain starts. There is nothing more important for riding safely in the rain than the rider having the clearest vision possible of the road and potential hazards. Minimizing fog helps eliminate stress and also drastically improves safety.
Rain-X or similar products applied in advance and stowed on the bike for the windshield, face shield of the motorcycle helmet and/or glasses can help them from fogging up as well as beading the water. For riders that don’t have the room to store it on their bike or who have forgotten it, these anti-fog products are sold at most gas stations.
In a situation where the rider hasn’t applied or doesn’t have these anti-fog products, when having the helmet’s face shield cracked open a little bit, or needs to clear the fog to ride safely, do what scuba divers do to prevent fog on their face mask — apply spit to the surfaces the rider is trying to see through. Wiping it on the surfaces and then drying it off with cloth really is a tip that works.
The windshield, face shield and glasses have very small dimples where tiny particles of water can gather to form fog. Saliva and anti-fogging agents help spread out the tiny particles. Because of the strong surface tension of water, the tiny particles join to become larger drops that are too heavy to stay on the surface and slide to the bottom, thus eliminating the fog.
Although spitting on a face shield and/or glasses may not sound appealing at first, when a motorcycle rider is wet, cold, agitated, and knows they are in a dangerous situation, this motorcycle tip for reducing fog quickly becomes more appealing.