YOU have to remember that wfp is a tool and you have to master this tool
but if
you are doing first cleans that have not been cleaned trad we ALWAYS use a bit of
soap in a bucket and if its really bad then use some trf dip the brush in the bucket
of soapy water ( im waiting for the uproar ) and scrub all the frames and just a touch on
the glass to soften the crap do all the windows upstairs and down rinsing all the soap off!
then go back to the first window and wash the glass only and not the top frame then rinse off
with a lot of practice this will be second nature BUT only go for the soap if its a real first clean
hope this helps as its the only way we do it bytheway we have never been called back in 4 years wfp