3 tips. High pressure, high heat, and good chemical. Besides that, make sure you cover everything in plastic, under and around the hood. If they don't have good drains, funnel the water into a trash can or get a good 2 stage vacuum to pick up the water. I have a good vacuum personally. It has a built I sump pump for water removal. That saves the back. Hope that helps. Any questions, just let me know. I've been hood cleaning 10 years now.
You may want to look into IKECA | Cleaning to a higher standard the longest running hood organization I know of in the Powerwashing Industry to see if some "Hoodies" can help you out.I am looking for a Company that can teach me about Hood Cleaning. Any takers or advice