A lid that turns matte black after a few cooks is collecting soot from yellow/orange incomplete flames. Fix the flame first (yellow / orange burner flame), then clean the canopy. Wiping soot without fixing ports just paints it on again next weekend.
Related: spider webs, clean burner ports, degrease, flare-ups. Finder: /.
Procedure
- Lid open. Preheat. Photograph flame color on each tube.
- Yellow on one tube: ports / venturi on that tube. Yellow on all after a tank swap: regulator reset first.
- Cold. Clean ports and inspect venturis before you scrub the lid.
- Wipe the canopy with a grill-safe degreaser. Keep alkali out of venturis and off bare porcelain chips.
- Rinse cloths often — soot smears. Dry.
- Relight. Blue flames should stop new soot in a cook or two.
- Persistent soot with daylight holes in a tube: replace the tube (measure first).
- Grease tray packed: grease tray full — smoke is not the same as soot, but both are overdue maintenance.
FAQ
Is soot dangerous?
It is a combustion symptom. Fix the yellow flame. Do not ignore roaring orange tubes or flame at the shutter (flashback).