I think each to their own,
hot or cold,
we all clean windows and aspire to do it , and work the best way we can, if you have a tank , any type... a pump , a pole and power to send it to a window.
Then you are water fed pole window cleaning, working for yourself, up and running.
After you have done that, ........then its up to each individual how far they take the business,.... stay happy with your lot or strive to be the best you can.
Its what makes each individual unique.
And it is purely choice,
Gary.