1, if the engine does not leak oil and there is only dust and dust on the surface, then it is ok not to clean it, which will not harm the engine.

If the engine leaks oil, it is best to clean it regularly. Engine oil leakage is common in valve cover gasket. The leaked oil will stick to the whole engine, and the oil will easily stick to dust. When dust, dirt and engine oil are mixed together, the engine will form a thick layer of sludge after high temperature baking.

Because sludge is corrosive, if it is on the engine circuit or rubber pipe, it will corrode these parts, leading to accelerated aging of the circuit and rubber, so it is best to clean it. It's best to go to specialty store to clean the engine compartment, because they have special cleaning agent, and the cleaning effect is very good. They are all very professional.