I got some mice in my outboard I got them out and the wires fixes what's the best way to clean the mice pee and poop
.................... but that was your power source

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But that aside, I'd seal up the air inlet, electrical connections and anything else that could be affected by water and carefully start at the top and work downwards with a minimum amount of water.
Do this on a hot sunny day to dry it as quickly as possible along with (if not too big) finally running the engine in a clean garbage can of water to completely dry it.