Can anyone help? I have a 1998 A4 and have noticed with all the frost around my mirrors do not demist. I take it that they will heat up when the heated rear window is on? I have checked the fuses and they look ok - everything else in the car works fine. The Haynes manual shows a 10Amp fuse located within the heated rear window switch. Can anyone confirm this. If so, how can I get to the fuse without damaging the facia/plastics? I don't believe it is a problem with the elements in the mirrors as they both do not work, i can however check with a resistance meter. Any ideas??????