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Nowadays denim garments are phenomenally popular among the people of all ages especially to the youth. To get the soft and comfortable feeling along with fading effect, different kinds of denim washing techniques are used which is most of cases synthetic chemical based. This paper practically throws the light towards the washing of 100% cotton indigo dyed denim garments using natural substances like soapnut, lemon juice, tamarind, and sunlight. Cotton denim ready-made garments were taken through washing with lemon juice and tamarind at 60 C and carried out for 30 minutes. Different properties of the washed samples were investigated like Weight loss%, Shrinkage, GSM, Strength, Whiteness Index, Color Difference, Reflectance Value and Color strength in the washed fabric. Weight losses of the samples washed by natural reagents were almost three times less than synthetic chemical washed samples. Natural washed samples had less amount of shrinkage as well. Moreover, the samples which were naturally washed contained greater strength and less color difference values than the samples washed by synthetic chemicals. Hence, the results have introduced a new concept of pollution-free washing system of denim fabrics.