You can wash them as you would your own shampoo and conditioner. We also recommend using a hair treatment on them every few weeks, because the hair is not attached to your scalp, it is not getting the oils it should be. Using a treatment/hair mask will need to wash your extensions too much, about every 3 weeks. The extensions can be blow-dried on low setting, but it is not recommended to do it too often. It is best to let your hair extensions dry naturally after washing them.