My 7-year old niece who has blonde hair was visiting from Florida. Her mom had sent along a packet of the Malibu C Swimmers treatment. After two days of swimming in my pool, her hair was green. I used the Malibu C Swimmers treatment on her and I could actually see the green coming out of her hair! It was amazing! This is the first product that I have found that really works for getting that green out!! I placed an order today!!