i dunno....
How To Remove Melted Plastic From Toaster

-Dab nail polish remover on a cloth, then rub away the plastic
-Dab WD40 on a cloth, then rub away plastic
-Try rubbing alcohol on a cloth, then scrub away plastic
-Heat toaster again until plastic is soft, unplug toaster then firmly wipe off plastic with a damp cloth. Wash out the cloth then lightly sprinkle on some baking soda while cloth is still wet* and rub gently over remaining plastic residue to remove. *Wring out excess first¨ you don¡¯t want dripping water.
-mother the plastic in petroleum jelly, set for a minute, then wipe off
After removing the melted plastic, wash area well with a hot soapy cloth to remove any remaining cleaner residue.

Here is a link that might be useful: http://tipnut.com/how-to-

Try De-Solv-it. There's a regular and a professional grade. It's a citrus solution and pretty safe, I suppose. I got mine at Ace, but you can probably get both types at HD or Lowes. I think the regular strength in available in grocery stores. Don't be too quick to scrape it off; let the solution do it's job and gently work it around with your finger. I've never used it on melted plastic, but it's worked for me a other things that nothing else came close to removing. Good luck!

I'd trest a small test spot with acetone nail polish remover.

WD 40 did a decent job for me. Not gone completely but not screaming "white wrapper on top of a black surface" anymore. It's ignorable now.

mikie-gw worked great cleaning oven ty I hadn't found a way to clean it

the nail polish is the one I used

A plastic bag melted on the front of my toaster oven a year ago. Today I tried the vinegar/baking soda paste removal method and it wiped right off after letting it sit for about 10 minutes! Miracle! Thank you!!!

I used the liquid form of Bar Keepers Friend and a Mr Clean Magic Eraser. Worked like a charm!