2001 C240,W203. This morning ambient temperature was 2c. The inside of my windscreen badly needed demisted, yet on pressing the arrowed button (which I believe is the demister?) it took a good 10 minutes of me sitting on my driveway waiting for enough screen to become visible to safely drive off! My 23 year old Toyota clears the windscreen in a minute, maybe two at most. What is the quickest way to clear the windscreen on a cold winter morning?