Cleaned my oven with Mr Muscle today - wow it is strong smelling and over powering. It comes with a warning that if you get any on your skin you need to rinse under water for 20 minutes.
Here's my oven before the clean. You spray on the noxious Mr Muscle and leave for half an hour.
Wipe down your oven and this is how it looks!
Voila! A beautiful clean oven.
I have two ovens - this the large one that I very rarely use.