Microwave door film

Hi everyone,
On the inside the door of microwave there is a film like plastic. It has some food stains on it which I have tried to clean. I suspect that they are between the glass and the film, and am wondering if i can just peel the film thingie off and replace it. But I cannot find it in replacements parts.

Any help would be appreciated.
Jen

Jen, i wouldnt suggest you try replacing it yourself…any time a door is repaired on m/w it needs to be checked for leaks with a meter before using,if its bad enough to replace better let a repair person do it for your protection

Thanks so much for your advice.
It’s not too bad just looks bad.So I’ll just put up with it till I can afford to buy a new one.
Jen