Engine injection system to clean the engine room or not

Electronic fuel injection engine house is typical. Within the engine room. The house electronic equipment. The receiver and multiple terminals. Which of these things. If there is water leaking into the system. May cause damage. With the part. Or the engine is not smooth. So if you want to clean the engine room, it can be done but should not be used with high pressure water. The engine is very dirty. And want to use high pressure water cleaning should pay for plastic bags covering the parts related to electrical systems. The house is entirely electronic, such as the need for the fuse box and the connector of the power cord