Apparently there are different kinds of clarifying shampoos, but the women there recommend the 99 cent bottle of Suave! Which we already keep on hand here.. even with a culligan water system, we have problems with hard water. Our hairdresser recommended at clarifying shampoo at least once a week - and it really helps keep my hair from turning orange.
More on clariflying shampoo use:
More tips for avoiding green hair if you spend a lot of time swimming in chlorine: