Diagnosis
Normal splatter from frying and roasting. The grease carbonizes on the upper heating element shield.
How to Fix It
Unplug and cool completely. Remove all racks and pans. Use a damp cloth with warm, soapy water to wipe the interior ceiling and the metal shield around the heating element. For stubborn residue, use a paste of baking soda and water. Let it sit for 15 minutes, then scrub gently with a non-abrasive sponge.
If That Didn't Work
For baked-on carbon, use a dedicated ceramic cooktop cleaner. Apply, let sit, and wipe. It's formulated for high-heat residue.
Heads Up
Never use steel wool or abrasive cleaners on the interior coating. Do not submerge the base unit. Never spray cleaner directly onto the heating element.