Beyond use in the consumer markets, detergents affect applications ranging from automotive lubricants to remediation techniques for oil spills and other environmental contaminants, paper and textile processing, and the formulation of paints, inks, and colorants. Faced with many challenges and choices, formulators must choose the composition of detergents carefully. The fourth and latest installment of the Handbook of Detergents, Part D: Formulation enables formulators to meet the demands of the increasing complexity of formulations, economic and sustainability constraints, and reducing the impact of detergents on the environment to which they will eventually be released.