Did this conservatory tomorrow, how much should I charge? I only charged £15 (for roof only) took about 45-60 minutes. They definitely wouldn't have paid £30. I used my normal brush I use for windows, is that ok or will it dirty it up too much for the windows afterwards? With the moss and green stuff up there. Used an A-Frame ladder for two of the sides. Also, how do you clean a roof? I plugged into their tap and used tap water to get all the big **** off then finished with pure- right way?