A clean engine is a happy engine. Runs cooler, easier to spot potential problems -- MUCH easier to work on if needed. I use Simple Green. I never cover anything, just go lightly over electrical areas (never had a problem). And I use low pressure "gentle shower" setting. Any crap needing more effort to clean than that, I do with a rag by hand. I also let the engine cool a bit before spraying.

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Sean 'ZCaptain' Kester
Rockwall, TX
'01 Alpine Green XE 4X2 3Pack
'82 280ZX Coupe (modified)