A great home remedy for shiny hair is a vinegar rinse. Each hair has an outer layer of hair called cuticles. The cuticle is made of overlapping layers of long scales that lie along the surface of each strand of hair. When we shampoo our hair, the shafts open and residual ingredients get trapped underneath it, resulting in ragged uneven hair. If using on hair extensions, try to only saturate mid strand to end of hair. The properties in vinegar removes shampoo and other product build up underneath that makes hair dull. Most shampoos and soaps are alkaline; vinegar has an acidic property which will control the PH balance in hair. This is what you need to do: After shampooing, mix one cup of either white or apple cider vinegar with one cup water and pour over hair then rinse thoroughly. Once the vinegar rinses all the debris, the hairs cuticles close resulting in smooth and shiny hair. For an even bold effect rinse with a blast of cold water to seal those cuticles.