What is the proper way to clean the interior of the oven?

Allow the oven to cool completely and unplug it from the electrical outlet. Use a damp cloth and a mild liquid soap solution or spray solution on a sponge. Never use harsh abrasives, corrosive products, or steel wool pads as these could damage the oven surface. (Page 7)

From the official Cuisinart Air Fryer Toaster Oven manual, page 7

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