The amount of washed wool is derived from the unsaved. For example, when 20 kg of wool is obtained after washing 18 kilograms of wool, the efficiency of these wool is 90 percent (18 out of 20) effective factors in reducing the efficiency of two species: A- internal factors: which are produced in the wool itself, such as the diseases of Gary, Jerry, Wilde, and non-foreign factors: which are imposed out of the dust, fat, and unbalanced materials.