Got an Answer?
Iv tried a lot of the natural approaches... I don't use "chronicles any where else in my house but once a year I spray my oven with the strong shit
It's just too much hard work otherwise
I put an ovenproof dish full of water in a 150°C oven for about a half hour before turning the oven off, then with my heat resistant gloves (I nicked a pair of my dads welding gloves) I take a damp cloth and wipe over everything I can, wringing and rinsing as I go. The steam lifts most of the gunk off so all I have to do is wipe it.
Mix up a paste of baking soda lemon juice and a tiny squirt of detergent then use a sort scrubbing brush or tooth brush to apply and scrub then leave for at least 15 minutes. To remove use more lemon juice or white vinegar and you can scrub a little more if it needs it. Then water and a cloth to get everything off