It’s a mystery how baking slop gets deposited between oven door glass panels. Cleaning them out looks impossible, but all you really need to do is dissassemble the door. It’s simple and takes less than an hour. Really.
1. Remove the oven door (consult the manual for how to unlock the hinges and lift the door off). Then remove the exterior trim panel by removing the screws that secure the front panel to the oven door frame. Note their location and store them in a cup. Then carefully lift off the panel and set it aside.
2. Remove the glass. Remove the screws from the glass hold-downs and set them aside. Note the location of the retaining tabs above and below the glass. Lift out the glass and handle it carefully (it’s expensive and breaks easily!) and clean it.
3. Clean off the crud with a nylon scrub pad, hot water and degreaser. Rinse and dry, then clean with glass cleaner. Wear gloves to prevent fingerprints as you place the glass back onto the oven door. Be sure the glass sits inside the locating tabs before you reassemble the hold-downs. Then install the hold-down channels and screws and the trim panel. Put the door back on the oven.