[Spruce]

Here's one for the hot debate.

There is a windie who posts on Youtube who had a diesel heater fitted by one of the suppliers recently.  Whilst being filmed the fitter was upping the advantages of hot water cleaning.
He said that if a window was in the hot summer sun the window would dry off (steam off) quicker with cold water than the same window using hot.

I know about the Mpemba effect where hot water freezes quicker than cold, but I can find nothing to verify this fitter's statement. 

[NWH]

I’ve been called many things but I’m not daft enough to keep using hot water all year round if it was no better then cold,it’s easy enough to keep trying to convince yourself that hot is no better if you’ve not used it for any length of time, it’s a bit like thinking an SLX is light until you try an Extreme pole.