I do something similar - cover the intake and wet down, then dowse with Simple Green - let sit for one minute (be careful with cleaners as prolonged exposure can cloud your aluminum) - wipe around with a wet rag then hose off. Let it sit in the sun for a bit and remove the plastic around the intake. I do the hood liner and spray off the radiator as well. For an added touch, once dry you can take your Endurance saturated rag and wipe down the hoses and black lines - makes them sparkle!

-- John