Pressure washing chemicals include detergents, degreasers, biocides, and specialty acids that remove dirt, oils, organic growth, and stains more effectively than water alone. They work by breaking soil bonds, improving dwell time, and pairing with PSI and GPM levels to lift contaminants without harming surfaces. This guide explains the core chemical categories, how surfactants interact with different soil types, safe application methods, and key selection frameworks that match...