On the majority of modern cars, it is totally safe to spray your engine bay with water. Today's vehicles have covered air boxes and weather-proof wiring
Engine Wash Advice 2019+ Ford Ranger and Raptor Forum (5th Generation)
Is It Safe To Use Water To Clean Your Engine? - Insights
How To Clean Your Car's Engine Bay - JB Tools Inc.
How To Refurbish Your Engine Bay
How to Wash, Clean And Detail Your Engine Bay
A Canadian's Guide To Storing Your Car For The Winter
If I am using starting fluid to start my car, is it safe to spray it directly into the air filter, as this is the easiest place to access? - Quora
Spray on Engine Cleaner and agitate the area with a detail brush to remove grease, oil, dirt, and grime. More information
Engine Cleaner
A Canadian's Guide To Storing Your Car For The Winter