[Jays Window Cleaning]

Gets muck off much easier keeps your hoses nice and flexible in the winter . I'd say from cold to hot I get done about an hour earlier .

Lovely when you get a right mucky one off for or a first clean  half the time with hot over cold . You wash your dishes in hot water ....because it help clean it quicker and easier .

[NWH]

I wouldn't advise cleaning at 60 degrees to often as over time it will weaken the glass,even in the summer with water to hot you can damage the glass,big patio glass doors have been known to go bang and shatter when the temp drops later in the year all of a sudden. I've known this happen to other cleaners and they use very hot water, to clean with. In my experience you are safe with 45-50 degrees I've never had one to bang on me on or off the job.

[Smurf]

Not knocking it just wondered....I use 60c water for carpet cleaning and over a say 25m run it takes a good 2 minutes first thing at 400psi to get it warm at the wand and that's hose laid indoors.
Every time you halt the flow it soon cools down.

Not when you are using a 16kw on demand heater it don't

[Splash & dash]

Not wanting to be controversial, this is a genuine question how does hot water over time cause that to happen when glass is manufactured its liquid then cooles, shorly if it's going to crack it will do it when you put the hot water on it initially , how can it be affected months later The glass cannot alter its structure and gradually weaken unless there is some form of damage , I have cracked one pain of glass using hot water but there was a chip on it and it cracked from the chip across the pain and this wasn't on a cold day and the water wasn't that hot , this isn't a dig Ime genuinely intrested

[NWH]

If you keep cleaning it with very hot water any time of the year over time your stressing the glass I've had the odd pane of glass creak with hot water on a day when it's not particularly cold at all.Im not talking about when your cleaning it Ive know it happen on hot days,customers have said they heard a bang went upstairs to see a window shattered. With the sun it's a gradual increase in temperatures with 60 degree water all of a sudden covering the surface it's thermal shock.

[Tosh]

If you keep cleaning it with very hot water any time of the year over time your stressing the glass I've had the odd pane of glass creak with hot water on a day when it's not particularly cold at all.Im not talking about when your cleaning it Ive know it happen on hot days,customers have said they heard a bang went upstairs to see a window shattered. With the sun it's a gradual increase in temperatures with 60 degree water all of a sudden covering the surface it's thermal shock.

What were you before you were a window cleaner?

[Splash & dash]

So are you saying it's like metal fatigue?  Interesting points ide not thought of it like that before