In general, it is common to wash the entire body before prayer, and there is a strong focus on personal hygiene in many Middle Eastern societies. However, some parts of the body may be considered more susceptible to becoming dirty or in need of frequent washing.
For instance, the feet are often touched, and it is customary in some cultures to remove shoes when entering a home. As such, the feet may be regarded as requiring special attention to cleanliness. Similarly, the hands, which are used for a variety of tasks, may also be considered to require frequent washing.
It's important to note that these perceptions of cleanliness can be influenced by both cultural and religious beliefs. However, it is not appropriate to generalize about the views of all people in the Middle East, as individuals may hold different beliefs and practices.