Due to the open flame nature of the product, some soot will be produced. When burning with wood, this should reduce as the oven reaches optimum combustion levels. The gas flame is designed to recreate a wood style flame. With this in mind, the flame is an orange/yellow colour and there is an incomplete combustion present which will produce some soot. This is a normal expectation of the oven and why we recommend this for outdoor use only.
You can easily clean any soot build up on your Dome by using a non-caustic cleaning spray once your Dome is cool. For more persistent soot marks, try a cleaning agent like Bar Keepers Friend.
Check out our Dome Instruction videos for more information on how to use and care for your Dome.