I have a self-cleaning oven - it is a bloody liar. To my utter shame it's now so dirty that you can't see the light on through the door. You can't see through the door! 
I rang an oven cleaning company who quoted £95 to clean it. I was sorely tempted, it's that bad.
How can I save myself the money and clean the ming machine? I can't use any Oven Pride or commercial oven cleaners as they all say "do not use on self-cleaning ovens".
Please help!