Directions for use: It is important to wash your mask, hose, and reservoir using the neutralizing pre-wash before the first use of your SoClean and anytime you introduce new equipment to your CPAP system. The purpose of this is to neutralize any pre-existing odors from detergents and to remove any residue from manufacturing that could react with the activated oxygen. Use the pre-wash in your sink with water, like you would with ordinary dish soap.