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WapCar Help Does anyone ever clean the engine bay? Is it necessary to clean it? Any guide? I have driven my Mazda for years. I recently saw the engine bay is very dirty. Without cleaning, a lot of dust tends to stick to the engine which I read is bad for the fuel efficiency too, and causes the engine parts to wear faster. I would like to DIY wash the engine bay. Can anyone here ever clean the engine room can give me some guide?