Cleaning a range cooker! HELP

[AgathaMystery]

I need a few hints please - I've got a dual fuel range cooker and I've tried so hard to give it a good clean but I can't get the inside glass doors looking like new and there seems to be marks between the 2 layers of glass.

It's 4 yo but I haven't loved it like I should.

Can you unscrew one of the panels to take it off to clean it? The cheap oven cleaning kits from b&m with the acid bags are brilliant by the way - I really rate them.

Ps why are you cleaning your oven at this time on a Saturday night?!