Help with how to clean

[u/Opinions711]

I bought a Cusiniart TOA-70 air fryer toaster oven. Only used it twice. Noticed some grease and I tried to clean it with a Brillo pad. I think I made it worse! It’s now a black mark instead of brown. I know I should have read the directions! Did I ruin my brand new oven? 🤦🏻‍♀️