Cleaning should be accomplished:

Cleaning from the top to the bottom is the most effective method because it helps to ensure that dust, debris, and contaminants are eliminated in a systematic manner. When you start at the top, any particles that fall during the cleaning process will land on surfaces that have not yet been cleaned. This allows for a more thorough cleaning since you are preventing the need to go back and re-clean surfaces that may have been affected by debris falling from above.

This approach is particularly important in spaces with multiple levels such as shelves, light fixtures, and ceiling fans, where dust and grime can accumulate and fall during the cleaning process. Cleaning in this order minimizes the chance of spreading dirt from one surface to another, ultimately leading to a more efficient and satisfactory cleaning job.

Other methods, such as starting from the bottom or moving side to side, can lead to increased inefficiency and necessitate multiple cleaning passes, as dirt could be transferred from higher surfaces back onto those already cleaned.