On 13/01/17 08:49, NY wrote:
"The Natural Philosopher" wrote in message
news
Why tepid? I run the hottest water I can from the hot tap and fling it
liberally on to the screen. Been doing it for oodles of years with no
problems.

Tim

I pour a just boiled kettle on it

Thermal shock of boiling water on glass that is at around zero degrees.

yes. helps get the ice off

Don't want to crack my windscreen. Also, I'm not sure whether the rubber
of the wiper blades and the surround to the windscreen (between glass
and car body) would withstand boiling water.

I can assure you they all can*, but the water is down at around 20
degrees by the time it reaches them.

*black metal easily reaches 100 degrees in tropical sun.


--
The biggest threat to humanity comes from socialism, which has utterly
diverted our attention away from what really matters to our existential
survival, to indulging in navel gazing and faux moral investigations
into what the world ought to be, whilst we fail utterly to deal with
what it actually is.