Depending on your oven model you can clean your oven following the two methods.
Steam cleaning
Cleaning is a breeze with steam. A 30-minute light oven cleaning that’s chemical-free. Just add water and vinegar, turn on the steam cycle and wait until the grime is softened and loosened. Grab a cloth, some detergent and wipe. Your oven is clean again. Easy.
Traditional cleaning
Mix four parts of baking soda with one part of water and mix it together until it forms a thick paste. Then use a cooking spatula (some similar utensil that helps spread the mix) and spread the mix on the dirtiest parts of your oven only and let it sit for about thirty minutes. After that, grab a grout sponge and dip the sponge in straight vinegar and then just scrub vigorously. All the dirt should come out easily