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My engine bay wasn't really that dirty when I started, it was just dusty from driving. I started by using a shop vac with a thin hose to suck out any sand that was deep in the engine. I then went over everything with a wet and dry towel. After that I wiped down all the plastic parts with Zaino Z-6 detail spray. I finished by spraying all the hoses with Stoner's Trim Shine, I really like this stuff because you just spray it on and walk away.