Hi, was wondering would anyone know why my rear dimister isnt working, i think ive checked all the fuses in the car and there fine and when i press the button on the dash the light comes on but the window just wont clear, never has since i bought it a year ago but im thinking now would be a good time to try and fix it as i have all the interior out of the car at the minute sorting out another problem. any help is very appreciated.