I have been there and I have joined a group where everyone washes their hair. As far as I know, very few can be washed off. Most will leave scars. As for the comparison of his hair before and after washing. Let's put it this way: after washing once, apply the medicine for 20 days. Wash again. Apply the medicine for 20 days. Washed many times. Take a photo. The post on the forum said it was the second time I washed it. It seems to have washed well. In fact, it is eye-catching. My area is small. Charge me 20,000 yuan. Before going, you have to issue a ticket and pay a deposit, which is very mysterious. The actual cleaning performance is not as good as advertised. It's seriously out of proportion to the asking price.