On a scale from one to ten, one being best ten being worst. How important is it to have a clean windshield. I never seeces to amaze me that driver will travel with bugs ,dirt, scum, smears and not even lift a hand to clean it. But all DOT cares about is if the quotes work, they might check to see if your windshield fluids are working. Usually not checking that. But how many times have you started driving into the sun or at night and had the glare blind you. Just thinking .