You need a cheap supply of booze....
Find your LOCAL still master and buy 20 gallons from him.
Or whatever fills the tank 1/3 of the way.Empty tanks and add said BOOZE a day or so before rough weather.
Let it sit for at least a day.Caution...no smoking.
Go sailing...enjoy the said rough weather.
While sailing run/pump all lines until they smell like said BOOZE.
Dock and go get a good dinner for the admiral.
Wait 3 days and flush whole system with fresh water.
If you do not have a local supplier buy a still and make your own.They are reasonably priced on the net.