Wash The Shell Hair's hair extensions for women only when necessary, when they become messy or dirty. Avoid frequent washing as that might lead to friction and breakage. Tips: Wash in cold/room temperature water. Use a mild shampoo and a moisturizing conditioner, and let it soak for 10 minutes with the conditioner. Rinse and air dry just like your natural hair. Avoid excessive use of heat tools. Make sure you apply heat protectant spray/creams before applying heat.