Have had for some years the above with double oven - at that time I didn't know what I was buying ie would not have wanted a double oven unnecessary for myself.
Anyway the two ovens are like double glazed with pretty big enough gaps between the panes. If you as much toast a piece of bread the glass starts to fill with condensation between the panes and of course when toasting or cooking for a while the condensation turns dark brown and every now and again - I unscrew the panes wash and scrub them and bring them up like new again.
Just a thought I'm having - would it be dangerous if I never put the second pane back again and went on cooking.