If you use Pinterest, you've probably seen pins for a "miracle" oven door cleaner that turns an ugly, dirty glass oven door into a perfectly clean one. I saw it, too, and thought: "You mean the glass doesn't have to look brown???"
So I gave it a try. Now, my oven is about 2 years old, and while I've wiped the glass down with soap and water or Windex, the fact is, neither or those really touch the grease that makes a glass oven door look dirty. Unfortunately, I didn't think to take a "before" picture, but trust me when I say the glass part of the door was entirely brown.
First - and Second - Try
The "miracle" door cleaner is nothing more than a baking soda and water: Take 1/2 cup of baking soda and add a little water at a time until the mixture is a spreadable paste. Then spread this paste all over the inner glass part of the oven door. Wait 15 to 20 minutes, then scrub with a cloth to remove the grease.
But when I did this, my door didn't look any cleaner. I did notice the baking soda paste had a slight brown tinge, though, so I let it sit another 10 minutes. That didn't help; my door was still dark brown.
Third Try's the Charm
So I removed all the baking soda paste and sprayed the glass with Windex - and used a Mr. Clean Eraser in circular motions. Viola! The icky brown stuff came off without a ton of effort! I now have a clean oven door.