"Updating the website would be helpful. My recollection is the dirty plastic could be processed but gunked-up the machine so that clean-out was more frequent."
How's this then:
Change it from...
"With its revolutionary Plastic2Oil (P2O) technology, Plastic2Oil Inc. has pioneered the development of a process that derives ultra-clean, ultra-low sulphur fuel, directly from unwashed, unsorted waste plastics."
into...
"With its revolutionary Plastic2Oil (P2O) technology, Plastic2Oil Inc. has pioneered the development of a process that derives primarily sulfur-rich air polluting #6 bunker fuel and a gunked up machine that requires frequent clean-out from unwashed, unsorted waste plastics."
Et voila, the truth emerges!
"Updating the website would be helpful", but they can't update it to be truthful.
It's fitting that crayons were part of the Plastic2Oil story. Only children could believe it.