Since hair extensions do not receive natural oils from the scalp as our own hair, they do not need to be washed as often. For clip in hair extensions: We suggest only to wash the extensions every 15-20 uses or when there is too much accumulation of products. Keep in mind that the less you wash your clip in extensions, the longer they will last. For hair extensions: We suggest only to wash the extensions twice a week. You can wash your hair extensions in the same way as your own hair. Always use the shampoo first, then apply a generous amount of conditioners from top to bottom. The best way to dry your hair extensions is to let them air dry. It is highly recommended to use sulfate-free and alcohol-free hair products, as these ingredients can dry the hair. It is also good to use hair masks on your extensions from time to time to make sure they stay nourished and healthy.