I recently purchased a hemp shampoo bar after reading many great things about how they are natural and don't have any chemicals in them. I have also read on quite a few websites that you need to use a vinegar rinse or your hair will get a build up on it. I was wondering if anyone here that uses a shampoo bar will tell me what they do? The company whom I bought the bar from says that you don't need to use a vinegar rinse but after reading on so many other sites that you do has me slightly confused. I hope someone can shed some light on this for me. Thanks all!