If your hair and scalp are used to shampoos containing silicones and petroleum derivatives, it will take a few weeks to months for them to accept a natural shampoo. Especially with rhassoul clay, you might experience some dandruff or dry hair at first. A vinegar and water rinse should help. Be careful, vinegar burns in the eyes 😉

If that doesn't work at all, Aleppo soap would be another option. Ideally, it should contain a high percentage of laurel oil.