Wash dreadlocks just as you would wash a sponge, by working the soap in and then squeezing and rinsing repeatedly to get all the soap out. To keep a dreadlocked hairstyle in top shape, use a shampoo or soap that is free from residue, and when applying wax to your braids, make sure you use small amounts and thoroughly coat the hair. It is also recommended that you use waxes that don't contain petroleum.