Johnson's Medicated Shampoo Johnson's Medicated Shampoo has been designed specially to clean scurf & promote a healthy coat & skin. Johnson's Medicated Shampoo is suitable for all breeds. Directions Shake well before use. Mix shampoo into 300ml warm water. Wet coat thoroughly with warm water & apply the mixture all over the body. Massage well into coat, but use ginger tips around the head, taking care to avoid eyes, ears & mouth. Rinse very thoroughly, towel dry, then brush & comb. Keep pets warm after bathing.