What is Co-Washing
Basically it is using conditioner, instead of shampoo, to wash your hair. While often shampoos and conditioners have similar ingredients, conditioners often contain additional moisturizers that can help hair regain its moisture.
Co-washing benefits more coarse hair texture like Type 3 or 4, which tends to be a victim of dryness. If you discovered your hair becomes dry after washing, try co-washing.
Here is a basic Co-Washing Regimen
Co-wash your hair 2x a week with your favorite conditioner. On every other hair washing session, deep condition her hair. Results can be seen within 3 weeks.