How do I clean my oven window without damaging it?

The oven glass gets covered easily with grease and food residue that darkens fast. The thing that works best is making a paste with baking soda and a bit of water, spread it on the glass and let it sit for a few hours (or overnight if it's really dirty), then gently scrub with a damp sponge. Avoid harsh products and hard scrapers that scratch - baking soda does the job without damaging the glass and it's cheap.