The first step is to gather the stuff you need to clean the windows like brushes, towels, water etc.
The second step is to clean the windowpanes from outside because this area faces most of the dirt.
The third step is to spray water on the windowpanes and then clean them with towel and change the towels as soon as its get dirty. You can also use newspaper instead of towel. Don't clean the windows in direct sunlight, as it will take your time and energy. You can also use solutions for cleaning which are easily available in the market.
If something has spilled in your oven you can sprinkle salt on it that will prevent it from catching fire and it will also make cleaning easier. You can also use solutions available in market or you can simply wipe off the stains and food by a warm, wet towel. Don't forget to wear gloves before cleaning.