Foolproof way of defrosting car in morning;
1. start 10/15 mins before driving off.
2. Brush snow/ice off driver's door and side mirrors.
3. Pour kettle of tepid/warm water around driver's door seal and lock.
4. Start car, ensuring wipers are OFF (motor will b urn out if wipers frozen to windcreen), putting heat direct to winodws at setting 3-4, heated rear window ON.
5. Pour kettle of tepid water over windcreen, dry off excess with cloth to avoid re-freeze if necessary.
6. While car is heating up,brush snow/ice off rest of car with good stiff brush, starting with roof, moving to bonnet, boot, then sides.
7. Check windscreen/mirrors/back window clear before driving off, using kettle of tepid water if not as in 5. above.
8. Switch off rear window heater when cleared (hard on battery and also increases fuel consumption)