First, remove the drawer from under the oven and put it aside. Look at the bottom of the oven door; if you have double glass panes, there will be an air vent space or spaces between the two glass panels.
The items you will need for cleaning:
1. Something thin enough to fit into the vent opening, and long enough to reach the drips on the glass. A wire hanger or long-handled bottle brush are a couple of good options; or in some doors you may be able to use a long, thin piece of wood (a thin dowel rod, for example.) The size and location of the vent hole will help you determine what will work best for your oven door.
2. A long, clean piece of cloth; a long sock works quite well.
3. Water with a drop or two of dishsoap in it, and/or window cleaner.
The cleaning process:
If the vent openings are small, you may have the best results using a wire hanger. Untwist the hanger, and on one end of the wire secure the cloth moistened with mildly soapy water or window spray. Push this up through the opening and move it around to clean the drips.
Another great option is a long-handled bottle brush. When using the bottle brush, a long sock might work best for the cleaning cloth. Have a good grip on the sock, or attach it with tape or rubber bands so it will not come loose and get stuck between the glass panels. Use the same cleaning method as described above.
The vent space on my oven door is open under the entire glass panel area. I am able to take a thin piece of wood (dowel) for cleaning. This may not work with many oven doors, if the vent space is smaller. It is very important to make sure the item you choose to push the cleaning cloth between the panes is not too thick or tight. You do not want to get it stuck in the door.
After the drips are wiped out, I like to take a dry cloth and spray some window cleaner on it and, using the same process as described, wipe the entire glass panels clean.