New to the board and roof washing. anybody ever use the x-jet for roof washing? a lady at exterior is trying to sell me on it. i see the pumps seem to be the preference here. also, the place i worked at previously just used hot pink deck wash(sodium hydroxide, i think) through a down drafter for asphalt roofs. I never did one myself but a guy that works there tells me we should do it that way. I really want to do it the right way. My first roofs would be already established customers and I don't want to disappoint. Any help would be much appreciated.