Windscreen wipers are not supposed to freeze, although they sometimes do in ice and snow. If your windshield wiper becomes frozen, do not pour water over it as this can crack your windshield. Instead, turn your vehicle on and set the defroster to high on the warmest temperature. Allow the wiper arms to defrost naturally until you can gently and safely pull each one off of the windshield without breaking it. Once both your windshield and the wiper arms are defrosted, use a dry towel to wipe down the blades.