Cleanliness is an important quality characteristic for market acceptance of food products. The present work was carried out to develop a cleaning machine which can deal efficiently with the peanut seeds. A peanut cleaner was developed and constructed based on the application of some determined physical and aerodynamic properties of the peanut seeds (Giza-5). It consists of a set of oscillating sieve made of steels, mesh of different sizes. Upper screen (12.5 mm diameter) prevents pods bigger than shelled seeds, medium screen (8 mm diameter) retains medium peanut seeds and allows passage smaller peanut seeds, while bottom sieve retains smaller seeds. A centrifugal fan was incorporated to remove shills. The experimental research has aimed at quantitative and qualitative influence on separation quality indexes of the following operating parameters: kinematic factor, feed rate, air concentration coefficient, and air velocity ratio. Based on the data obtained by the measurements and qualitative indicators the cleaning process indexes have been determined, namely: cleaning efficiency, cleaning capacity and cleaning loss. A prediction equation describing the cleaning process in the peanut cleaner using a mathematical model based on physical and aerodynamic properties of peanut and machine characteristics was carried. Results showed that the optimal kinematic factor and feed rate were 1.5 and 0.11 kg/m2s, respectively to achieve cleaning efficiency of 97.5 %, 2.45 % cleaning loss and 410 kg/h cleaning capacity. The cleaning efficiency of 97.3 % with 3.8 % cleaning loss was recorded at 0.3 air concentration coefficient and 1.3 air velocity ratio (air velocity = 7.54 m/s). The cleaning efficiency model showed a significant effect between the predicted and experimental result at 5% level of significance.