How to take care of synthetic dreadlocks. Synthetic dreadlocks are low-maintenance, but proper care will keep them looking fresh and lasting longer. Washing: Wash your scalp, not the dreads themselves. Use diluted shampoo and gently massage between the sections. Rinse carefully so no residue stays inside the dreads. Drying: Always let them dry completely. Pat with a towel and air-dry; avoid sleeping with wet dreads to prevent odor. Styling: Synthetic dreads don’t like heat. Avoid straighteners,