Yes I have used vinegar but not for the dry hair problem. Vinegar is great to use after shampooing and what it does is, removes product residues like hair sprays and gels that are stuck on the hair. Just make sure you tilt your head back at the way to avoid getting it in your eyes(ouchies). You can buy a deep oil treatment in grocery and pharmacies. We own a salon and there a good treatment called Moroccan Oil but it's very expensive.