Basically water with some deisel fuel, oil and grease, plus any other liquids that collect in the lower parts of the hull.
Water comes from nminor leaks through the hull plate joints as the hull flexes, condensation, spills, rainwater etc. Then there are many parts of machinery that have oily parts, such as propeller shaft bearings, engine lubrication, fuel spillages, and so on, that all can contribute a bit of hydrocarbon to the mix.
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