I've been using a bar soap, Savon d'Alep (that's a type, not a manufacturer) for both body and hair for over a year now. It's mostly Olive Oil, with Laurel Berry Oil (I use one with 40% Laurel, but that's hard to find), water, and lye. I have long hair and it has never been happier. So is my skin. I tried it because I was tired of being someone's chemistry experiment and wanted to stop applying any substance with ingredients with long, strange names to my body. I don't use any conditioner any more either. I don't need it.
This soap may be hard to get in the States, as it is manufactured in Syria's largest city, Aleppo, but you can find it in most health food stores in France (Bio-Coop and Biomonde stores). I can't speak to whether or not it is available in Spain. I have seen it on Amazon.com in the past, but it was very expensive. Anyway, I recommend it to you.