Let the engine cool completely
Disconnect the negative battery terminal
Cover the battery, alternator, air intake, fuse box, exposed wiring, and sensitive electronics with plastic bags or waterproof covers
Remove loose dirt and debris by hand or with compressed air
Apply a degreaser to dirty areas
Let the degreaser sit for the recommended time
Gently scrub stubborn grime with a soft brush
Rinse lightly with low-pressure water or a damp cloth
Avoid spraying water directly into electrical components
Remove all plastic covers and bags
Dry the engine bay with microfiber towels
Use compressed air to blow out water from tight areas
Reconnect the battery terminal
Start the engine and let it run for a few minutes
Check for any warning lights or unusual behavior