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I've been washing motors for years and there no need to cover the altenator with a bag. Just don't stand there spraying it directly forever. If they were that sensitve to water the Nissan Engineers would have installed them in the trunk. Believe me the splashsheilds only are really there to keep the big things out, minimize belt squeal from water splashes, improve aerodynamics and aid in heat extraction of the engine bay!
I've found that most japanese cars are great for cleaning the engines cause the distributors were sealed really well and always cranked right up other washing. Now the cars I'd be scared to wash are of the Ford brand. They've had the worst sealed distributors in the world, next to MG's. If the car was outside and the humidity was extremely high or it rained that morning. I had to break out the WD40 and spray inside the distributor cap to start the vehicle... It sucked! Anyways clean them up! A clean engine is a HAPPY ENGINE!
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