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I cover the alternator with a plastic bag, spray water with a garden hose, spray a degreaser, agitate with a brush and let sit for a couple of min, spray it down again with a garden hose and dry with a towel. Simplest is sometimes the best. Everything in the engine bay is water sealed, it will be fine.
If you gonna use a pressure washer, use a short nozzle from a distance and don’t blast wires and random hoses from short distances. Washed plenty of engines this way, no issue.
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