To change things around a little.
A lot is being made of the fact that some spotting can occur with WFP, all very true, it can.
Now if you clean a window the trad way, (squeegee), try doing one when the the sun is at a low angle (Roger will know what I mean; the window you do in town? the paint shop?)
Now it has nothing at all to do with the sun with regards to cleaning it, but if it is at the right angle you will see squeegee kicks, lines and marks where you have detailed.
Do not kid yourself that you have done a perfect job, you haven't.
As Roger (Squeaky clean) will tell you, I am a good window cleaner and I think I always work to a pretty high standard.
There are one or two accounts I clean that I have gone back to cleaning trad, doing it with WFP I noticed that I couldn't quite get it right, I'd do the inside of this shop window (A Greggs shop in Caldicot (for the local guys)) and would notice some spots, this was on the next clean wherebye I would do the inside first rather than the outside (7am in the morning as against 4:45pm in the afternoon, getting goods laid out in the morning and the reverse in the afternoon)
So I went back to cleaning them trad.
The sun is now at a certain angle due to the time of the year, and now I am really struggling to get them perfect with trad, I always have to dodge back and forth picking up bits
But the upshot is that the job done with WFP was (is) considerably better with WFP than trad.
There are various reasons why you will get spotting, its mostly user error, particularly if it is on the type of windows where they will usually come up spotless.
So trad guys (and girls), don't kid yourselves that you are doing work that is top banana, there WILL be kicks from the squeegee, there WILL be marks from detailing, you WILL get lines from the ends of the squeegee.
And all of these tiny little faults will be exacerbated if the light is coming through the glass at the wrong angle!
And just as some glass is a nightmare for the WFP'er so some of it is for the trad cleaner (Tosh, Roger, you have both done the Kings head, the window on the side? Ollie and Matt do it now, and they can't get it right either)
There will be some new georgian windows that are an absolute swine to clean the trad way, use a cut down squeegee and you will have no end of detailing to do, and there will always be marks.
Clean them with spray & buff with microfibre or scrim, or use a wet scrim/drim scrim you will always get smears.
Don't kid yourself that you won't, you WILL.
There will be times that even with ladder mitts you will mark the walls, damage the sills.
Your squeegee WILL mark the edges of certain styles of windows, or leave score marks in the paintwork.
A few spots from WFP?
I know what option I'll be sticking too
Mind how you go now
Ian