The two benefits of cleaning your vehicle’s glass are that (1) you can see better – especially at night and in times of high glare: sun-up and sun-down, and (2) other vehicle drivers can see you better – so that collisions can be avoided.
Your headlights deserve special attention, for they not only make it easier for others to see you, but they make it easier for you to see at night. Clean headlights provide 250-500 feet of solid visibility; dirty headlights provide half of that or less.
Clean your windshield, all windows, taillights, brake lights, and turn signal lights. You won’t be sorry; you will be safer.