Slightly Greasy Hair

Important to note: This was my first experience with an all natural shampoo bar. After waiting 2 weeks for my hair to adjust, this is my review.
I was really excited to love this bar. It's brand is QUITE eco friendly from the packaging to the ingredients. The only problem is they don't work super well. My hair perpetually feels a little bit greasy. Not I-need-to-shower gross, but I-should-wash-my-hair-tomorrow gross. This issue can be resolved by an apple cider vinegar hair rinse, then its like any other shampoo except I feel better about my carbon footprint. I just don't think a shampoo should require household ingredients to work properly.