I wouldn't shoot any water under my hood, no. If you wrap parts of your engine well (ignition coils, especially) then you can use a steam blast under the hood to degrease and get rid of dust. A safer and more thorough alternative though would be a long afternoon under the hood with rags, Simple Green, and some brushes.
-8000K HID low-beams/PIAA Spark 8000 high-beams/PIAA Plasma GT-X corners
-Type II brakes/some weight reduction/new tires every 4-6 months
-NA1 NSX wheels: Kumho Ecsta SPT 225/50V-16R in front, Kumho Ecsta ASX 205/60V-15R in rear
-Custom built six-puck kevlar clutch/Lightened (aluminum) pulleys
-[Mugen/Showa] suspension with remote-adjustable dampers
-C35A1/C32A1 hybrid swap; smog legal (by GreenLight Auto)