Marks on the stone

Black marks or burnt food on the stone

Burnt food. Run the oven above 350 °C for about 3 hours (the help centre: full flame for 60 minutes), then once it is cold use a soft brush and a vacuum with a plastic nozzle (the manual). Marks that stay are normal. No water, no chemicals.

Tom's Guide found, on the Arc XL, that the front of the stone never gets hot enough to burn clean, and food sticks between the stone and the oven lip. Brush it gently when cold; do not take the stone out to clean it.