Dawn or any good detergent or alcohol will act as an emulsifier and allow the gasoline to mix with the water.
If in doubt, get some dry ice and drop it in the tank and let it sublimate. It will force most of the oxygen out of the tank... and reduce the risk of explosion. However, try not to use too much Dry Ice since the CO2 concentration in the boat might go up and put you at risk too.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.