By Zahna Eklund You can stop your car windscreen from getting frosty this winter with one £2 item, according to experts. If you’re due to be driving around to visit family this Christmas, the last thing you want to be doing is standing out in the cold with an ice scraper trying to defrost your car so that you can drive safely. While many parts of the UK are facing an “unseasonably mild” Christmas Day today, snow is still forecast across parts of Scotland, and some of us will still be facing frosty mornings over the coming days. Thankfully though, there’s something you can do to prevent your ca…