In response to Sonic James Doom
Don't use boiling water from the kettle - use cold water from the tap. There's three reasons for this. First, cold water is still warm enough to melt the frost. Second, the heat of kettle-water will stress the glass in your windscreen as the outside layer will warm and expand much more quicly than the inner, hence increasing the risk of your windscreen shattering; cold water avoids this problem. Third, hot water will evaporate much more quickly than cold, thereby cooling the windscreen and making it more liable to refreeze.
( Enzyme is powered by sunlight, Thu 15 Nov 2007, 10:07, Reply)