Dean:
"why does the main (self-cleaning) oven in the range look so dirty?"
It is strange, isn't it? The oven floor appears to be brown with soil or staining of some kind, yet the oven door liner is clean inside the gasket, as you'd expect if the P*7 was being used. Outside the gasket is a different story, but then nobody but AW members ever hand-cleans that area.