Im trad,standing on conservatory roof frame isn`t an option.you can purchase a conservatory ladder for around £400.This is what i use [urlhttp://cgi.ebay.co.uk/3M-EXTENDING-WATER-FED-UPSTAIRS-WINDOW-CLEANING-BRUSH-/200590863686?pt=UK_HomeGarden_CLV_Cleaning_CA&hash=item2eb425ad46][/url] Bought mine for £10 3years ago. Other than being wfp you will need customer to have an outside tap.