Microbes are probably the best answer. There is already evidence that they are eating a large proportion of the plastics and oil that is dumped / spilled into

Microbes are probably the best answer. There is already evidence that they are eating a large proportion of the plastics and oil that is dumped / spilled into the ocean. https://www.sciencemag.org/news/2019/05/these-tiny-microbes-are-munching-away-plastic-waste-ocean https://www.sciencemag.org/news/2019/05/these-tiny-microbes-...