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In reference to your question about washing the engine bay and hugh-pressure water. It's very simple, don't use high-pressure water at all. THere are so many electrical connections that you don't want water to enter, so be careful. I wash the engine bay with a soapy water and soft brush, and rinse off with running water at very low pressure, almost a tricle of water only. Then I dry it with paper towl or or other towl that doesn't leave residue. Start your engine right afterwards so the heat will take care of leftover water and humidity.
Sorry it took some time for me to get back to you on this. I hope it helps. Good luck!
T.