I've lived in my house for thirty years. I've never, once, cleaned my wall oven. How do they get dirty? I never understood that. I guess amateur cooks have boil-overs with foods dropping to the oven bottom, right? As a gourmet, vegan chef, my oven has stayed clean as a whistle, even though I use it a few times a week. There's a bit of carbon build-up, if I look very, very closely, but it's too thin to even be measured.
