ASAP, Can someone please help me on plastics and pans?

I would try a solvent like Acetone or Methyl Ethyl Ketone (MEK.) Just be sure there aren't any open flames nearby while using those chemicals. Also, wear rubber gloves and work in a very well ventilated area. Outside is best. Those chemicals are readily available in most hardware stores. Look in the paint department.

Alternatively, you could try to burn away the residue. But that will create smoke and fumes that you don't want inside your home.

Good luck.

Put it in the freezer for an hour or two the plastic should contract and release, or at least be easier to remove when you take it out. Otherwise you'll have to use a strong solvent like Orange oil.