Similar to @YYZRC, spray with PP, leave for a little while and then power wash. Light spray off the tops. Also best done before launch so to drain out otherwise like @Handymans342 said, suck or mop it up.
Yes, you can rinse with low pressure like a garden hose. The connectors are all IP65 or better. Don't use a pressure washer on the top of the engine, but a hose is fine.
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Regards,
Ian
The Third “B”
Secretary, Ravena Coeymans Yacht Club
https://www.rcyachtclub.com/