There is a button on the oven door. Most people don’t know how useful it is.

First, put on protective gloves and ventilate the kitchen. Next, open the “flat” oven door and line it with kitchen paper. Next, spray the stained surface with ammonia and let it sit for 30 to 40 minutes. Finally, rinse the glass with a damp cloth after discarding the gloves and paper.

Clean the oven glass with white vinegar