Uses a Ninja FlexDrawer, mostly on the Bake setting with a small foil tray under the food; after a few years of this they rarely do more than wipe it with a paper towel and the inside looks almost brand new.
“I also almost only use the 'Bake' setting as it lowers the fan speed to reduce splattering and stuff blowing around. Cook times are about the same and food comes out the same. I'm using Ninja FlexDrawer.”