Sofie's preferred method is to apply the toner on a cotton round and gently rub it all over the skin. Initially, it may cause some irritation, but since it is also a toner, it helps the subsequent layers of hydrating and moisturizing products to penetrate the skin more effectively. She highlights that this toner plays a crucial role in the skincare routine for those dealing with milia, as it serves as the first step in the process.