The first step of properly cleaning under your hood is to dry vacuum as much dust and debris as possible before using any liquid/sprays.
Anyone that know's anything... knows that.
I've never taken a hose or pressure washer to my engine bay and I'm sure it's in the top percentile of cleanliness compared to other cars on the road. Positive actually.
A vacuum, spray cleaner and rag will go a long way.
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