Fill a bucket about half full with hot water. Add three drops of dish soap and mix to create suds.
Scrub the inside of the oven door glass with a sponge and the soapy water until all visible traces of dirt, oily residue, or food are removed. Rinse the glass with a rag and clean water, then dry thoroughly.
Clean the outside of the window panel by spraying glass cleaner across its surface and wiping in a circular motion with paper towels. Avoid getting the glass cleaner into the door vents on the oven.