Clean Your Windshield Wiper Blades
If your windshield wiper blades get dirty, they’ll streak the glass instead of keeping it clean and clear. Make a solution of ¼ cup household ammonia to 1 litre cold water. Gently lift the blades, and wipe both sides with a soft cloth or paper towel soaked in the solution. Then wipe the blades with a dry cloth before lowering them into place.