To maintain the durability of the diwan set they should be hand washed or light machine wash. Do not bleach or use hard detergents as it may damage the fabric and it's colours or prints. It might cause the colors to bleed. Washing in cold or lukewarm water will be beneficial for the material and will help to stay in a good state for long. Also dry in shade as direct sunlight might fade the colors of the diwan set. You can soak it in water for some time to retain the color and so that excess of color washes away. This will increase the life of the bedsheet and make it even more soft.