I've tried so many different shampoos and conditioner over the past few decades that I could fill a store. The two shampoo's I narrowed it down to is #1 All Systems and Dr. Bronners pure liquid castile baby mild soap
Dr. Bronner's Magic Soaps Retail Store: Classic Liquid & Bar Soaps
My main conditioner is #1 All Systems. As a final rinse, I use 2 tablespoons of Bragg organic apple cider vinegar to one pint of distilled water and pour mainly from the back of the ears to the and including the tail. It's amazing at how it cleans the coat, heals itchy bumps and keeps the fleas off.
Buy Bragg - Organic Apple Cider Vinegar - 32 oz. at LuckyVitamin.com