I use the Suave Daily Clarifying shampoo almost on a daily basis and I don't find it harsh at all and it's cheap. I've also tried the Neutrogena Anti-Residue which is good if you can get pass the smell...ugh! Basically, a clarifying shampoo is just a formula consisting only of detergents with no conditioning agents or film formers. Any clarifying shampoo should work and if you're hair is dry, just alternate the days it's used.