when everyone quote conservatory roof clean is that all you clean i prefer to clean the whole conservatory and call it a valet inside and out on the glass
for a conservatory that size it 2.5 hours work minimum to do a proper thorough job id be looking for 60-75quid depending on how i guage the customers willing to pay
i always ask them how much they paid to have it installed knowing it will be in the 1000s i then make them feel guilty and ask how often have they had it properly cleaned
i say well you wouldnt let a car worth that much not be cleaned for X amounts of years as it will increase maintenance in the long run
this then make our service more valuable
