The main problem is customers opening horizontal windows after you've gone.
You will get a line of spots down the middle below.
EVERY TIME!
now that one I will agree with! I could throttle customers who open windows the second you have finished cleaning them.
Open windows? Fine, not a problem! Just don't shut them and then open them afterwards!
But in reply to other posts: Oxidised frames? I have learned to get them right now, hardly ever get them wrong.
Vents? Well use your eyes and steer clear of them.
Oxidised br
Black rubber seals? Again, I have more problems with doing them trad than I do WFP.
But trad skill are vital, there are no end of occasions when you need them, insides, builders cleans, certain windows that are so ropey that the only way you can clean them is trad. And so on.
Plus if you go into window cleaning via WFP without trad experience, and you are not well clued up on running a business (as against window cleaning as a simple job) you will almost certainly get your price structure totally wrong...
Ian