I got this Cleansafe Monitor Cleaner, I have never used it for engine parts but, it really cleans the dirt off keyboards, TV's and computer monitors, it contains no amonia oil or wax so, it shouldent damage the surface. It foams when it comes out of the can. You can pick it up at WAL*MART, if it is not good for the intake, it's good for the TV's and monitors cause, they shine after it's applied and wiped off, seems like it would make car windows shine really good too.