You don't need to be careful around your alternator. Don't purposely get it soak and wet, but if you do, simply wait for it to dry out BEFORE you start your car.
The only thing I ever cover is my intake cover. I then spray absolutely everything with Simple Green, and I spray it very generously. I let it sit for 10-15 minutes, then I put the garden hose on a mist setting and spray everything off. The only time I will put it on a constant stream is when I angle it in the valve cover to get the suds out of where the spark plug wires are attached.
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