Just put a bag over both DCI and either use a pressure washer from a fairly high position, or you can just hose the engine bay. make sure those DCI's are completely covered and that no water will get in the. Also make sure your engine is completely cool or else you will mess it up. I wash my engine bay of my cars every two car washes and I wash the vehicles weekly. Looks clean the car just feels clean and with time I believe a clean engine bay will help the engines longevity. (hope it helps)
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