trad definetly !! you can do a beter job. eg. bird crap , fly spotting , spiders webs always a struggle with wfp . when actualy in front of the window on your ladder you know 100% that its been cleaned well . i agree with the saftey aspect of wfp and high level work but as far as doing a proper job trad will always be the best . you have to ask yourself if you werent a window cleaner and you seen the trad guy/girl(need to be pc) with ladder , bucket , blade , scrim . or you seen someone using a wfp . who would you want cleaning your windows??? and before someone out there says ,i d chose wfp because you wouldnt want to see the window cleaner fall of his ladder. well lets face it the customers prob aint too concerned about you ! they just want there windows cleaned . in this day and age people want the best service possible and im sure comparing the two , wfp and trad . people will go for trad.