Is It Necessary to Clean the Exterior of the Engine?

[VonColin]

Cleaning the exterior of the engine is necessary. Functions of cleaning the engine exterior: After prolonged use, a lot of dust will accumulate on the surface of the engine. If not cleaned for a long time, this dust will turn into a thick layer of sludge after being baked by the high temperature of the engine, and it may also corrode some engine components. Cleaning the engine exterior not only maintains cleanliness but, more importantly, reduces the damage caused by corrosive substances to the external parts of the engine, thereby extending the lifespan of the engine components. Precautions for cleaning the engine: If the car is used in a very complex environment, not only should the exterior of the engine be cleaned, but the interior should also be cleaned. After a period of use, dust and impurities entering the engine compartment can form harmful substances like carbon deposits and gum on the engine surface. If not cleaned for a long time, these harmful substances can turn into sludge, seep into the engine surface, and cause damage to the engine.

[VanLily]

I believe that cleaning the exterior of the engine is necessary, primarily to maintain overall cleanliness and vehicle health. Having driven older cars, I've seen many with engine bays covered in thick layers of dust and grease, which accelerates wire aging and even corrodes some plastic components. After cleaning, the cooling efficiency improves, preventing the engine from losing performance under high temperatures, and it reduces the risk of fire caused by oil buildup—after all, leaked oil mixed with debris can easily ignite. I personally do it every six months, simply using a high-pressure air gun to blow away loose dust and, if necessary, wiping down metal surfaces with a damp cloth. However, you should never use high-pressure water directly, as it can cause serious issues if water enters the battery or electronic components. Additionally, cleaning makes the car look brighter, extends its overall lifespan, and saves on major repair costs, which is especially practical for hands-on car owners.