Here are three methods to easily clean your backflow incense burners : Method 1: Alcohol Cleaning Spray alcohol on the lid. Use a wet wipe to rub back and forth. The grease will come off easily! For hard-to-reach areas, you can use a cotton swab. Method 2: Ash Scrubbing Dip a wet wipe into some incense ash. Rub it over your incense burners. The grease on your incense burners will be scrubbed off effectively. Method 3: Dish Soap or Baking Soda Cleaning If the grease on your incense burner is thick, soak the lid in water mixed with dish soap or baking soda for a while. This will make it easy to clean off all the grease! Click to learn how to clean incense burners