Cover the electronics with plastic bags.... Use degreaser of your choice and then wash off with spray from the hose along with not deliberately spraying any electronics. Start car immediately afterwards and let run for 5 min... Been doing this for 40 years with or without plastic and I've yet to have an issue with any of my cars.... Z included... Just spray the car engine compartment down when it's cold/just warming up if you are worried about water on the engine block...
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