Windows - use tea leaves (used!) and newspaper, they come up sparkling. If you use vinegar on glass, always use a clean water damp cloth to remove vinegar residue as it can eat into the glass. Meths also works a treat on glass (I put a capful of meths in my windscreen washer water to leave it streak-free).

For the oven glass, paste of bi-carb and lemon juice, leave it for a while and remove with plastic scourer then newspaper & water. The rest of the oven the same

Actually, lemon / lime or grapefruit are all good for cleaning.