I usually mix up a bucket of water with some dawn dish soap, disable my float switch and go riding for a day. The dawn swishing around in the bilge breaks up a lot of the crud.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD
1979 Marine Trader 44, twin Ford Lehman 120s
2006 Panga 14, Tohatsu 20
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