I did one similar last summer. As said earlier, remove all the secondary double glazing and make sure you know which panes came from which windows. When cleaning, make sure you have plenty of old cloths or towels to soak up all the dirty water or you'll be making stains on carpets or wooden floors.If you are leaning them against internal walls to clean, make sure you have protection at the point of contact, you'll either damage the wallpaper or scuff the paint.It took us around 22 man hours to do 72 large windows, both sides of secondary units and inside and out of main windows. They were absolutely plastered in fly poop and dead flies everywhere.Good luck
You're welcome.I forgot to mention, I just put down plenty of protection on the floor and used an applicator (just damp) and squeegee to clean the secondary double glazing units. They were that dirty, there was no way a light spray and rub with microfibres was going to get them up to scratch.
Ive done a few like this just remove them put them on a few cloths laid out and quickly trad both sides ,personally the quickest and most thorough way to do it good luck mate
i have an old manor with leaded windows and double glazing panels to clean (inside)I can remove each panel, what is the best way to clean them(both side)?many thanksBen