The results depend on the product you are opting for to clean the dirtiest oven. Firstly, if your oven is consisting the oldest and hard grease, grime, and burnt-on food, then pick a powerful cleaner like Easy Off Heavy-duty cleaner and degreaser spray. Then, read the instructions written on the product label and follow them. It's better to wear rubber gloves before applying the product in the oven, as gloves will help prevent your hands from the product’s chemicals. Now directly apply the cleaner to the oven's surface and let it sit for the time specified on the bottle.
Usually, 1 to 15 minutes are enough to tackle the hard dirt from the oven, but sometimes the dirt is quite challenging that can take hours to loosen. After the dedicated time, you must wipe up the cleaner properly by using a damp cloth or sponge. If you find the dirt still there, use the gentle scrubber to remove the food residue, grease, or dirt. Hence, keep wiping up the dirt with a damp cloth, and you can end up getting a sparkling clean oven ideally.