Neutrogena's Anti-Residue shampoo, which I use a couple of times a week. While I cannot say for sure that this removes most of the dulling residue left by my regular shampoo and conditioner as claimed by the manufacturer, my hair feels lighter and less greasy after using it. Of all hair products I've used, I love the clean, slightly medicinal scent of this shampoo the most.
Neutrogena Anti-Residue shampoo can be found at all drugstores in the US, but they seem to be discontinued in Malaysia. I remembering buying some at Guardian's two years ago, but have never seen them since. Boo!