What is Redwin Tea Tree Shampoo for? Tea tree shampoo revitalises the hair, making it looking healthy and revitalised. Redwin tea tree shampoo removes build-up left by other shampoos, softens, repairs and protects hair. pH balanced. Who is Redwin Tea Tree Shampoo for? Anyone who wants revitalised, healthy looking hair. When should I use Redwin Tea Tree Shampoo? Use as you would a normal shampoo - frequency of use will vary from person to person. Why should I use Redwin Tea Tree Shampoo? Tea tree shampoo is used for its natural antiseptic and anti-fungal properties. Redwin tea tree shampoo can help remove the build-up and residue left by other shampoos, whilst still being gentle on the scalp.