Oven cleaner K2r
My oven was the absolute disaster! I tried a lot and tried cleaners that did not help. Now I've got the K2r oven cleaner and eeendlich my oven is clean :-)
I sprayed it nice, waited a few hours and was able to remove the dirt 90% with a sponge. The rest was sooo ultra firm that I went over it with a scraper again ... but also that was super easy.
Oh and very important; it does not stink as disgusting as some other stuff. I can only recommend!