Joey's breeder told me that the number one mistake new owners make was not rinsing enough! She said that when I thought I was all done rinsing, set the timer and rinse 2 minutes more! If all the shampoo isn't taken out, the skin can become overly dry, and cause itchiness. Also, she recommended Bio-groom shampoo and cream rinse; you can get free samples if you email the Bio-groom company.
Bio-Groom - Exceptional Pet Care Products for Over 30 Years