:lol:thats why mine has got leather.
I dont see why peeing wouldnt work. Car gets dirty anyway
But seriously though if your petrol cap was stuck spray deicer or screenwash on it. Not water as it will freeze again! I can remember 1 day 2 years ago it was about -16c and water was freezing solid as soon as it touched the car. Even deicer was getting slushy. Now I'm not saying it that cold but just dont use water.