Historically, we equate washing with cleanliness. We wash clothes, linens, cars, dishes, and ourselves. So, it is logical that many people believe meat and poultry can be made cleaner and safer by washing it. Is this true? Does washing meat, poultry, eggs, fruits, and vegetables make them safer to eat?
Review of studies related to washing meat and poultry from several universities indicate that there is no benefit. In fact, washing can allow bacteria on meat and poultry to spread to other ready-to-eat foods.
Of course any solid dirt (sand, stones) will be removed and these can be a major source of bacterial contamination.
It thus depends on the situation, for food containing dirt (vegetables) it may be helpful, for meat it is not beneficial.