Hi. I'm Smitty. I am a professional appliance repair consultant here to help you diagnose, and repair, your appliance.
The only way to get it off is to start with a single edge razor blade. Carefully scrape off what you can. Once you have that done you will need some 900 grit wet and dry auto body sanding paper. Keeping it good and wet sand off the rest of the foil.
Ok. About now you are thinking "that guy is nutz! Sanding paper? No way!"
The 900 grit sanding paper is a very fine grit. With 1000 grit you can polish out scratches from glasses.
It is going to take some elbow grease to sand off the foil, but it does work.
You should be able to get the sanding paper at your local hardware store. ACE Hardware carries it for sure.
Thank you for trusting me with your problems. The Home Smithy
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We don't want to use a razor blade on a new oven.
I understand your concerns. This method does work. I would not advise you to do something that will damage the interior of the oven.
Once you start to sand you will see just how fine the sand paper is. As I mentioned it is going to take some elbow grease to get it off.
Get the sanding paper and test it on a piece of foil. You will see how much it takes to get through the foil that way.
Remember to keep it wet. Water is a good thing here.