It looks like you got most of the plastic off. My recommendation would be to run the empty D/W through 2 pots and pan cycles with heated dry to burn off the rest of the plastic and then start using the D/W again as normal

Thanks Jakvis. I have run two cycles and I am now just dealing with a burnt plastic smell. I think it is getting better though. I might put some actual dishes in there this evening. Thanks again.

Try rubbing or gently scraping on the residue while it's soft with the element hot.

This happened to us years ago. We ended up just burning it off through repeated cycles, but made sure we kept fans blowing and windows open to disperse what might have been toxic fumes.