alway price higher than your hourly rate for window cleaning as its specialist cleaning and a pain in the bum and harder work than just maintenance window cleaning.
an average polycarbon conny roof thats gone a bit green say and they want all roof and outside gutters cleaned(i dont do gutter clearing anymore)would take you about an hour and a half from pulling up to driving away esp if its awkward access with ladders needed as well.
if your hourly rate for window cleaning is say £25 an hour then you want at least £30-£35 an hour for conservatory roof or fascia cleaning IMO.so say £50 -£60 depending on how bad it is.
if its a regular clean say every other month when you do the windows and easy access then i do some for an extra £15 and takes me an extra 20 mins with just pure and no ladders needed.
some lads on here charge over £100 just for conny roof cleaning but include all windows and frames and are usually "one offs" as a result of big leaflet drops.
most of my roof cleaning comes from regular window cleaning customers so the windows are cleaned during the normal window clean.
add ons like conny roof/ fascia cleaning can be good money but dont just clean for the same price as window
cleaning or you ll hate doing them as its harder work!!
dazmond