This is possibly one of the easiest problems for mankind to correct .
We put in the center of the whirlpool a huge garbage nautilus collector , it fitted with solar panels would slowly rotate , it's open flute ends would scoop up the floating trash and bring it up or down in it's holding flutes interior ends . Then a ship could go out and empty it as needed . Then bring the oil based plastics on to a refinery .
Somebody with cash get on it .