Except for toast or bagels I never bake food directly on the rack. Of course it's going to leave residue. As far as not wanting to preheat, it's literally a matter of a few minutes since the oven is so small it doesn't take long to preheat. Baking is done on the bottom rack setting, toasting and pizza are done on the middle. Broil on the top. The only time I broil in it when when wanting to brown the top of something without using my torch. I only use frozen when toasting bread, since it's always frozen at my house we eat it so little.
It's not at all complicated to use.
Except for toast or bagels I never bake food directly on the rack. Of course it's going to leave residue. As far as not wanting to preheat, it's literally a matter of a few minutes since the oven is so small it doesn't take long to preheat. Baking is done on the bottom rack setting, toasting and ...




















