How do you get the burn...?

Popcorn fully covered with oil..... This normal..! That smell not the burn smell but only oily smell.

I am assuming you already cleaned the microwave thoroughly. And, you should also clean the immediate area where the microwave is stored and launder any linens that may have absorbed the burnt smell.

And, finally, curtains will hold burnt smell odors, too.

Put one cup of apple cider vinegar in a four cup microwave safe container and set the microwave on high for 2 minutes. Repeat.

Repeat.

The fan on the microwave will exhaust the vinegar fumes through the system, thereby getting rid of the smell. Some people hate the smell of vinegar, perhaps even worse than burnt popcorn, so maybe you should try this vinegar remedy at the end of the day.

Leave the microwave door open over night.

Never...it's penetrated the plastic.

EDIT: Ignore the idiots with their useful advise. The burn smell has penetrated the plastic. There is no way you can get rid of it...only throw it away. Or live with it.

Or you can waste your time doing what the morons have said and play about with vinegar etc, only to realise the smell is still there.

Too many idiots in this place...god it's getting tiring with "top contributor" imbeciles giving stupid advice.

Microwave a bowl full of water.