Have you tried putting the oven on with a bowl (ovenproof of course) of hot water in it for say 15 mins on low to medium heat, turn off, leave overnight or a few hours, then trying to clean it? Apparently if you put some ammonia in the water once you've switched the oven off that also helps but we (i.e my wife!) haven't tried that. She also used to use brillo pads - as they're wire wool rather than scratchy stuff they shouldn't damage the lining of the oven.
Hi there - I know this post is a couple of years old but as ovens only need a once a year clean (generally) I thought i’d let you know of an oven cleaner - called Four Éclat - there is a Facebook page with lots of before and after pics and 5 star ratings!
Paula, firstly please can you add your surname to you profile before you post again?
I’ve moved your other post to our business listings category which is the only place you can promote your own services. (feel free to add your facebook page links, contact details etc in there) Please refrain from jumping in to posts like this with commercial intent.