The answer to 'when to clean kitchen' is that you should clean your kitchen on a regular basis, typically 1-2 times per week. This helps maintain a healthy, hygienic environment and prevent the buildup of dirt, grease, and bacteria. Regular kitchen cleaning involves wiping down countertops, appliances, and other surfaces, as well as sweeping and mopping the floor.
The frequency of kitchen cleaning may need to be adjusted based on factors such as how often the kitchen is used, the number of people in the household, and any specific messes or spills that occur. It's generally a good idea to do a more thorough cleaning of the kitchen every 1-2 months, which may include cleaning the inside of the oven, refrigerator, and other hard-to-reach areas.