Regular maintenance cleans which most of us do day in day out there is just no need for hot simple as, hows hot water going to be any better or quicker when all there is is a bit of dust to clean off usually?
I don’t know where in the country you are but I can assure you we very rarely clean dusty windows , generally a typical property we do has seagull or other bird poo on several windows along with bee pollen and snail trails and other stubborn things that need removing , it would be a piece of cake if it was just dust . A lot of our work is costal and some properties ( holiday homes and holiday rental ) and shops we do on a daily basis during winter months and over night the windows are encrusted with salt and opaque you wouldn’t think they had been cleaned in 6 months but they were done the previous day , cold water will do a reasonable job but it’s painfully slow hot water desolves the salt and grime so much faster . I dont care if you and others believe this or not , it is a scientific fact that it does , it makes my working life so much easier and work far quicker , we do get quite a lot of work from other window cleaners that don’t want to do theses jobs beacause they use cold and struggle to do a good job in a reasonable amount of time and without using tons of water . Ime quite happy for ones to use cold water as I know we can do a much better job in a fraction of the time and earn a very good wage from this type of work , I am just trying to explain to open minded people the advantages of hot water, is it better than cold yes 100% , is it cheap to buy and run no , if you run a profitable buisness and or several vans working where we are it’s a no brainier , I have had several sceptical ones from this forum and another one come out with my guys for a day and they have been very surprised at what they have seen and two of them have now bought diesel 9kw heaters , hopefully they may see this and speak up ,. Each to there own but it cannot be denied that hot will clean better and quicker