Human hair dreadlock extensions can be easily washed with the help of residue-free shampoo. Lather the foam on the scalp and rinse with plain water. Wash once a week to make them feel fresh and clean. In addition, you can also deep cleanse your extension in the summer season to remove sweat and buildup. Washing the loc extensions makes them tighter. Hence, you can also jump in the seawater to get the salted treatment for your locs to make them clean and tighter. Air-dry the extension to avoid excessive heat exposure that can damage its quality. Following such minor tips will also help you keep your extensions for long.