Weber · Spirit Grills
What appears to be 'paint peeling' on the inside of the grill lid is actually baked-on grease and smoke vapors that have carbonized and are now flaking off. This is not a defect.
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Clean the inside of the lid thoroughly to remove the carbonized grease.
Use a stainless steel bristle grill brush to brush off the carbonized grease.
To minimize future buildup, wipe the inside of the lid with a paper towel after cooking while the grill is still warm.