Good point Jay, I see it's going to take me a while to get my head round the whole wfp thing. I'll order some gg3 then.
I cleaned a relatives conservatory windows today and they are double glazed upvc similar to mine. I took my time cleaned top frames thoroughly and then side frames, waited for them to dry then went back and cleaned glass up and down starting in bottom left corners and then rinsed from left to right, top to bottom, then sills. Once dried I checked out all the windows and they were an improvement on my home ones but there were still greasy patches in the corners and a few white spots. Am I doing something wrong with my technique still?
I did clean a conservatory roof today and that went great but no-one can see through that can they.
I still don't feel confident that I could clean a customers windows to a good enough standard yet so I'll have to keep practicing.
Thanks for the advice so far.
Cheers Dom