My daughters both swim and I have them wash their hair every day they swim. When they get in the car after swim practice the entire car smells like chlorine so I want it off of them. I have heard two ways to help prevent chlorine build up in hair. The first is wet hair completely before putting on swim cap so less chlorinated water drenches hair and the second put leave in hair conditioner in hair before putting on cap. Also rinsing hair with vinegar gets rid of the green.