For frosty windscreens and frozen wipers, I fill a washed 2L milk bottle with warm water, at around 30 - 40C and pour it all over windscreen and front side windows. It isn't hot enough to cause thermal shock, but there is enough heat in 2L to defrost and warm the windscreen sufficiently that you can drive away, and wipe the remaining water off your windscreen. The wiper rubbers are also warmed enough to be flexible, and give a smear free, undistorted view, and the inside of the windscreen does not fog up, especially if you started the engine first, and turned on the boost for the windscreen and the AC. Always ensure wipers are parked and switched off before leaving. Wife has a tendency to just switch off ignition with the wipers mid-sweep. OUCH!
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