uka Shampoo Brush Kenzanis a small brush with a lot of benefits. A silicone brush that can be used on the wet or dry scalp. A mold-free brush you can keep in your bathroom it has spiky bits to clean your scalp thoroughly whilst pushing pressure points on the scalp.A KENZAN, also called spiky frog, is a specific device used in the Japanese art of flower arrangement Ikebana for fixing the flowers in the container. uka named the scalp brush after it due to its similar looking. Available to buy online