Paul Mitchell's Tea Tree shampoo is the best I've found. I've been using it for 16 years! I've tried other brands, but nothing compares. It's a little pricy (salon brand), but I buy the jumbos when they're on sale at Ulta and save a ton, and they last me almost a year. I have a serious scalp problem (think like baby's cradle cap, except that I'm an adult) and this is the only shampoo that keeps it clear.