The Neutralizing Pre-Wash is a concentrated, fragrance-free, hypoallergenic soap that neutralizes any pre-existing odors from detergents and removes any residue from the manufacturing process. It should be used to clean your equipment prior to the first use of your SoClean 2. It may also be used for periodic cleaning of equipment as recommended by the manufacturer. One capful from the 8 oz. bottle should be added to one gallon of water for cleaning.
You can find step-by-step instructions here (scroll down for English version).