i still do downstairs TRAD and the up WFP
a few reasons really
1. i use less water ( i work from a estate car ) though it would be easy for me to pop home to refill
2. i sold the idea on the WaH rule, thus i only do upstairs
3. ALOT of my customers would not be happy with paying 10 quid for 10 mins work, so i take a little longer doing TRAD D/S
4. when i do downstairs TRAD i know its a 99% top notch job
5. The customers are happy with the Health and safety side of me not climbing ladder
thats about it, it works well enough
start at front of house, do upstairs WFP, move cart around rear, do upstairs with WFP
by the time you have done the rear, the front has stopped dripping, so you can do D/S TRAD front then back, leave your cart around the back so no1 nicks it
job done, nothing to worry about
i have started to do Conserv's with wfp AND windows above bushs (norm the front window)