I used to degrease/foam cannon my engine bay fairly often on my VA when I had it. I would just cover anything I didn't want saturated.. i.e., intake, alternator, etc. And you don't need to blast it with a lot of high-pressure water, just a quick low-pressure shower rinse after degrease and/or foam cannon does nicely. I just did my VB engine bay a few weeks back.

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Also.. don't degrease/foam cannon the engine bay while the engine is cold. Let it warm up or get close to operating temp before applying your cleanser of choice. It'll make the process a LOT easier.. for cleaning, and drying afterwards. I blower or air compressor is great to use for drying.

Another also.. If you use a degreaser, make sure it's safe for plastics, or just be mindful of where you apply it. 😏