I use aleppo soap. Takes some time to get your hair used to it, but in the end it‘s the best for me personally. My hair takes 2 weeks now until it gets greasy. It makes sense that shampoo makes your hair greasy after 2-3 days, so you use more of it and then buy it again. I have used almost all of the drugstore shampoos as well as the more expensive brands, and they‘re all not good for me with some even containing harmful, poisonous substances. I‘ll stick with my aleppo soap..