I'm doing a couple a week and have been for the past 4months now. I used to just use the customers tap water and scrub. Since I have found TFR and it makes the job so much easyer. Its a case of spray on, aggitate & rinse off. I tried the jet was to start, but found it a bit too messy and easily got carried away with what I was doing. Try the tap water method, then go to B&Q and grab a 2L bottle of swarfega cleaner, its in a red bottle and has a picture of a garden chair on the front. That's what I use. It works an absolute treat with warm water. I did a 5bed detatched the other day, fascia, soffits, gutters and gable ends and used 1/8 of the bottle. Did the job in 2 and half hours... Which seen as though there was upper and lower levels was really good. Really makes the job so much easyer in my opinion. Lots of other guys will agree with me too here