Distilled Water (for less residue) and Vinegar 50/50 mix in a bucket with a simple soft car wash brush.
All-natural, will rip through the brown/green slime with a simple soft scrub brush.
Then do a wax before storing so next year stuff comes off even easier.
I use that on my 'toon, much nicer than that muriatic acid crap that can etch. Vinegar should not hurt your gell-coat, not strong enough.
And if it does not work for you, your out about $5 at Walmart (FLL would be happy).
"Your mileage may vary,,,"
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