I am in need of help on how to clean hood vents ( from hood to fan, and surrounding exterior areas on the roof.) I have been approached by a restaurant chain to do cleaning and maintenance for several locations. I have been reading posts like mad, trying to get as much knowledge as I can, I figured that the people that do this on a regular basis are the ones that could guide me in the right direction. I would also like to know some of the pitfalls and things to watch out for, like not setting off the ansul unit (fire suppression.) I do not want to miss this opportunity, so any help would be greatly appreciated. I currently have a 4000 psi @ 4gpm hot machine. I am sure that is plenty to do the vent and hood, I just need to know how to proceed. HELP, and thanks for taking the time to look at this post.