See i have come to learn that the less oily/conditioned your hair, the easier it locks. This i believe is part of why african hair locks so well beause our the majority of our hair type is naturally dry. I myself was washing twice a week using Maylees soap, which my hair seemed to like cause it dried it out even more yet i kept itfrom being too drywith water spritzes and once a month jojoba hot oil. So i dont know if this would apply to all hair types, but to summarize: Shampooing your hair more often helps dry it out which helps it lock.