I hate doing conservatory roofs. I would rather start up a conservatory demolition business, but I would be happy to do it for nothing so....
I will only do them if the customer is an exsiting regular customer, and I charge by the hour at £50.
To be honest even I am in agreement that £360 for conservatory roof clean inside and out is a bit high especially if it's done in a morning. I would feel well and truly ripped off at that price.
In general to do a full inside and out clean for an average conservatory putting a price on it as a quote is hard. It takes me around 5 hours to do a fairly large glass conservatory to a perfect standard. But I do not seek out the work as I hate it.