Are there any common (preferably somewhat complex) organic molecules that help combat ocean pollution?
Chemical surfactants or dispersants are useful for cleaning up oil spills. They break up the oil slick and allow the oil to become dispersed in the water, so that naturally occurring bacteria can break down and oxidize the hydrocarbons in the oil. Dispersants are typically designed to be water-soluble at one end and oily at the other end--basically soaps or detergents. See http://masgc.org/oilscience/oil-spill-science-dispersant-bkgrnd.pdf for more details.