This shampoo cleans my scalp so well. I wash my hair every other day and I feel so confident that my scalp and hair don't smell bad in between washings. Although it is a bit runny, it is actually better since I can spread it easier all over my scalp. I have VERY thick shoulder lenght hair and this gallon lasted me 6 months!!!. The reason why I give this only 4 stars is , the scent doesn't stay. I wish it lingered but I guess that is the job of the conditioner.