I use Ovenpride, wipe it on last thing at night and wipe off the next day.
You get a thick plastic bag for the wire shelves put some of the liquid in the bag with the shelves give it a shake and leave it until the next day.
Thing is to do it regular and you will not have a problem.
If you use you oven daily and allow the build up of grease for months on end it will take longer to clean.
www.ovenpride.com/
I hate cleaning oven and this works for me.
A quote for those blessed with a spouse:
I bought 50 white wire coathangers for 9.99...lifechanger!!


