My name is Manu Harrison born in New Zealand first chemical cleaned a concrete tile roof in 1992 when working for roof painting company Carter Holt Harvey Roofing where I pressure washed roofs with 4500 psi machines with turbo nozzles. We were supposed to chemical every roof but never bothered believing high pressure was better and quicker. I have moved to England in 2003 with my English wife and we have two boys 7 and 10 . I haven't cleaned a roof for 20 years I have worked in landscape sales for 13 years . I'm ready to make a come back . I believe low pressure is the way forward.