How can I use Dr. Bronner's 18-in-1 Pure-Castile Lavender Soap as shampoo?

I tried it and it just leaves so much residue on my hair it just looks greasy and hard as if I was wearing a lot of hair paste.





Please tell me how I can use it as a normal shampoo. Thanks.How can I use Dr. Bronner's 18-in-1 Pure-Castile Lavender Soap as shampoo?
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