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Unplug the battery....cover a few electrical components with plastic bags....hit with with a hose...a little pressure is ok but don't hit it with really high pressure. Leave the hood open to dry......remove bags and fire it up....
 

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I've always had the best luck with the engine running i spray off any serious clumps and wet everything, except the intake obviously. Then I coat everything in simple green, greased lightning, or whatever degreaser let it sit for a minute or two and spray it off. Scrubbing bubbles works extremely well too. Repeat as many times as necessary. I've never had a single problem. I usually let it run for a few minutes afterwards and go for a quick spin to help it dry out.

In my early years I did it with the engine off and occasionally encountered a no start condition when I tried to fire it back up.
 
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