Oven cleaning has to be at the top of the list of cleaning jobs I hate doing.... hence why the before pictures of my oven are very dirty! I would love to pretend I left it to get so dirty just for the post, but it's just because I've been putting it off for so long!!
Start by preheating oven to 150F, then turn off once it reaches temperature. Pour 1 cup of ammonia into dish (I used a jam jar) and put onto top oven rack. Then place dish of boiling water onto bottom rack. Close oven door and leave in the oven overnight to work their magic!
The next day, take out the dishes and add the ammonia to a bowl of warm water and a couple of squirts of washing up liquid. Then start scrubbing and wiping down the oven - making sure you wear kitchen gloves. I found this stage much easier than usual, as all the grease and dirt has 'softened' overnight.