i do a few tops only
i allways charge 75% of the house price, afterall its harder work going up and down a ladder etc etc etc (of course i use WFP now, built it myself, DIY style, its the future
)
the water runs down on the downstairs windows, but that the price they pay, i often chuckle to myself, that they have saved 2.50 ish and then have to clean the downstairs that i expect will take them 30 mins