Some residue-free shampoos include Neutrogena Anti-Residue Shampoo, Uni-Locs Residue-Free Shampoo, DreadHead Dread Soap and Knotty Boy Liquid Dread Shampoo. Most shampoos, conditioners and styling products contain ingredients that build up and leave residue behind. Residue-free or clarifying shampoos combat this.
To combat dulling and excess residue, a clarifying or residue-free shampoo can be used once a week to strip hair of build-up. By doing this, natural shine is enhanced and other shampoos or styling products used likely work better, according to Neutrogena.com.
Wearers of dreadlock hairstyles benefit greatly from using residue-free shampoos, because most shampoos loosen dreads due to the moisturizers they leave behind. The aforementioned Uni-Locs Residue Free Shampoo, DreadHead Dread Soap and Knotty Boy Liquid are specifically formulated to clean the scalp and strip hair of all residue, allowing dreads to dry and tighten, as suggested on DreadHeadHQ.com. These products can be used as often as desired without risking damage to dreads.
For people who don't plan on wearing dreads, Neutrogena Anti-Residue Shampoo is likely the best option for a residue-free shampoo. It can improve the texture and body of hair by ridding it of the weight of build-up, and is appropriate for all kinds of hair types.