The same has happened to my 4x4 and I realised the actual circuit on the window has several breaks in it caused by my sheep dog scratching it. Im just trying to find some paint to repair it with - you used to be able to get some from Halfords but not any more. Found these websites which have some repair kits for sale. Hope its of some use.
http://www.triumphshop.co.uk/Quiller/Parts/new_products/rear%20screen%20demister%20repair%20kit.htm
http://www.gbdriver.co.uk/acatalog/car-windscreen-window-headlamp-repair-kit-DIY.html
Cheers
Tom Lane
December 2007
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.