The guys at FD are great. And its not a complaint against them. But the actual time you spend high and dry on the FD is only about 20mins. Its only time enough for a quick once over waterblast.
Depending on your draft, perhaps go to a bay like at Motuihe Island. On an incoming tide nudge up until your keel touches the sand. Anchor up. Jump overboard. Spend 20 mins cleaning as best you can. Then you've earned yourself a beer.