Chimney cap or stack heavily coated with creosote and tar-like buildup.

Safety first: Work on a cool grill. Wear gloves and eye protection; creosote can be messy and irritating.

Steps to clean:

• Remove chimney cap: Unscrew and remove the cap and any internal baffles.
• Scrape buildup: Use a stiff brush or scraper to remove creosote from the chimney walls and cap.
• Clean interior surfaces: Wipe with a damp cloth and allow to dry.
• Improve combustion: Use dry, high-quality pellets and ensure the combustion fan and exhaust path are clear for proper airflow.