I went through this same process a couple years ago. Searching returned very little. This is a restaurant kitchen, right? The hood filters should be soaked in a bath of commercial degreaser (terribly caustic stuff) for a couple hours, in the deepest sinks you've got. Be careful about an overnight soak because the degreaser will start to alter the aluminum itself. When you get them out of the bath, use a high-pressure sprayer to knock out what you can from behind the slats. Use grill screens and metal scrubbies to touch up by hand. Make sure the filters are cleaned with just soap and water at least weekly. I ran my kitchens so that each night we'd alternate cleaning the hood and the range. The hood itself needs to be cleaned by hand. The all of the ducting and exhaust can be cleaned by specialized services.
Unfortunately, as far as I can tell, there's no replacement for cleaning the range by hand. The 10-burner that I inherited was in terrible shape but with just me and my sous, we were able to get it scratched uniformly in about 10 hours. Use a little bit a degreaser and soak the grills for just 15-20 minutes (remember that they'll rust), then use grill screens and those grill cleaning brushes that have a flat blade on the front.
I hope this was of any help!