How to what is left behind when I have Removed the Melted Aluminum Foil from the Oven bottom
Reading through the comments following that procedure you cited, the original author of that article suggested an application of naval jelly (from the paint department at your local hardware store) as the solution that actually worked. Naval jelly is pink goop containing phosphoric acid that is used to remove rust from iron or steel, leaving a clean surface.

Essentially, you spread aluminum jelly over the aluminum, smear it around every few hours, leave it overnight, wipe clean and repeat process until the residue is gone. It takes days, but it is gentle with no fumes. The solution was was verified by several users in that conversation. You can read about the process starting here: 

 BK says: Back in November, I searched for a way to fix our new oven &hellip;

Bonus solution: The original article also claims that the entire bottom plate can be replaced usually for less than US$30.00. Contact your manufacturer for a replacement part and guidance on installing it.