hot water helps.....but sometime i still need to get my scraper out......its only an issue with the odd window here and there......
Hot waters a waste of time and money, been there done it and cold is just fine.
I would like to see you clean baked on seagull poo and salt off with cold and get a decent finish , it’s a scientific fact hot will clean faster and better
you keep telling ya self that.
Tell you what come out with us for a day and show us how good your cold water is on costal work , if it will clean it off I’ll pay your traveling expenses , are you up for the challenge 
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Mate, I live on the coast and clean bird muck and salt off all day every day with just cold. I get a lot of work from referrals so must do a good job (I'm confident in my results). I don't spend all day doing it either I earn a good crust.
I do fancy a hot water system though if it would make life easier for me at work, I would like to try it out. Does that offer stand to anyone? If so how far are you from North Wales?
We were cold wfp for 10 years and I thought hot was a waist of time , having had hot now for 5 years I know it’s much better , quicker , jobs on wooden sash windows that were always problematic and had to be gone over a couple of times are now fine on the first going over , we do a lot of properties that are literally at the high tide line and are quite often opaque with salt , sand and sea weed on the glass , cold will do it eventually but hot will do it far quicker at a guess we are doing the jobs now in a quarter of the time and getting better results . Trust me if I had spent 5 k on a hot system and it didn’t work or was no better than cold I would be the first to say it’s no good , knowing what I know now I wish I had gone hot years ago , all my vans now have it , it costs me around £65-80 per week per van in fuel but productiverty and time saved makes it more than cost effective , , if you fancy a trip to Cornwall and can do this type of job to our standards and at the same speed as me and my staff I will pay your expenses , that’s how confidant I am that cold won’t do it , I have been there and done it for many years and realise now hot is much better , ime not talking about ones that claim to be using 60-70 degrees water using an emersion heater , we use 9 kw diesel fired units , before having a diesel boiler I tried the gas route , waist of time and dangerous, emmersion heater was ok and gave nice supple hoses but not the heat at the brush that diesel does , , also pumps arnt rated to pump water above 60 degrees , unless you insulate the tank very well it also looses heat quickly and I have 1000 ltr tanks so that will hold heat more than a smaller one