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Use a microfiber towel to wipe down the engine bay. Suck up water from crevices, then remove the plastic covering. Replace or reconnect the battery when the engine bay is completely dry. Start the car and let it run until it reaches normal operating temperature.
Once you are finished rinsing, you'll need to remove excess water from the engine bay. Wipe down the entire engine bay, switching to a fresh microfiber towel when the one you're using gets too wet or dirty. Use a towel to clean any spots you missed with the degreaser. Use a leaf blower, compressor, or shop vacuum to suck up or blow out the water from small crevices. Now that you've gotten most of the engine dry, you can remove the electrical tape and plastic from the covered parts. Dispose of both the plastic and the tape. Though you've absorbed most of the water, you should let the vehicle sit, with the hood up, for an hour or so to let things completely dry out. Then, replace or reconnect the battery. Once the engine is completely dry, you can start the car. Let it run until it reaches normal operating temperature, then shut it off. At this point you are free to drive your vehicle as you normally would.