Bad Manners and Brimstone

I have a question right off. How difficult are they to clean?

I used a Galloping Gourmet oven in the 70s and 8os. We loved the food and my 8 year old used it for years. It just got too heavy for me. For comparison, I think the old Foreman Grills without removable plates are hard to clean and my small Instapot comes apart easily enough.