History of the internal combustion engine - Wikipedia

Pressure washing under the car bonnet is not safe, especially in modern cars, because high-pressure water can damage sensitive electrical components like the ECU, sensors, wiring, alternator, and fuse box, leading to warning lights or starting issues. However, gentle cleaning is safe if the engine is completely cool, sensitive parts are properly covered, only a low-pressure water flow or damp cleaning is used along with a degreaser, and the engine bay is dried thoroughly afterward. The safest op