Since I recently contracted shampoo-itis (otherwise known as fear of foul ingredients in hair care products), I was delighted to come across Chaz Dean. He hates shampoo and hasn't used it for 14 years. A man after my own heart. Plus this stylist to the stars and the person behind the WEN brand looks ridiculously Californian and has (like so many of his trade) an appalling hair cut that he obviously hasn't changed since he was a Duran Duran fan in the early 80s. Perversely, that made his appeal even stronger.
Unfortunately, WEN Sweet Almond Mint Conditioner - which is to be used in place of shampoo - didn't really live up to expectations. It is - aside from some plant extracts - largely made up of standard conditioning ingredients (glycerin and stearamidopropyl dimethylamine), silicone
and detanglers (behentrimonium methosulfate)
It has a preservative that is called methylchloroisothiazolinone.
In high concentrations it can cause chemical burns and it is a skin and membrane irritant and so it was largely removed from most cosmetic products except for those with only short duration skin contact such as rinse-offs. It also has another preservative, methylisothiazolinone, that was found to be a neurotoxin in a trial on rats (however, there isn't much other data).