Chemotrophs (specifically chemolithotrophs) are bacteria that thrive near super heated deep sea vents. They can consume (oxidise) iron, sulfur, and a whole range of other elements and compounds we consider toxic or immutable. In return they produce a kind of sugar that tube worms consume. I hope that future plastic bio-mitigation research focusses on energy transformation and production like this. Instead of thinking of an impossible zero sum end result (destroy it), it's more future oriented to use plastic transformed into something new and consumable as an energy source.

Think like a tube worm to solve this problem.

https://en.wikipedia.org/wiki/Chemotroph