I do the odd roof clean but only the type whereby I scrap the moss off and apply biocide. I've not pressure washed a roof yet despite p washing driveways and patios etc for a few years. It has to rank as probably the worst job to do for me to do and would love to pressure wash a roof but I'm a bit apprehensive to do it. An obviously bad condition roof is a no no, are there any other types of roofs or tiles you should steer clear of and would using the 12inch spinners on the roof mitigate some of the risk in using a turbo nozzle on a roof although I see some use them to good effect also? I like the idea of giving the custy an immediate result but don't want the water ingress hassle and the additional clean up looks time consuming also. Any tips and advice most welcome as I've had a few enquiries and keen to service my customers. many thanks.