"On very cold days, the water could turn to ice before you know it – and warm water freezes faster than cold water. If it refreezes, it'll create a layer of ice on your windscreen."
The AA added: "Worse, it'll build up on the wipers and freeze them to the glass, risking damage to the wiper motor or ripping off the rubber if you switch them on."
The AA recommends starting the engine, switch on the heating and turning the air blowers towards the windscreen, then turning on the air conditioning.
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"Before you know it, that frozen windscreen will start to clear up," the AA assured, adding that during this time you can clear the ice from the outside of the car. You can do this by brushing any snow off the car, and using a scraper and de-icer.
A simple way to prevent icy windscreens in the mornings is to use a shield across the windscreen – even cardboard works for this.