Infested with organisms that affect your homes appearance and property value. These pests are algae, mold, mildew and bacteria. They will eat and destroy wood, deteriorate roofing materials and retain heat. Simply put, these pests are COSTING YOU MONEY! Standard pressure washing only attacks algae, mold and mildew growth at the surface. Though the stain is gone, the roots remain and the stain grows back thicker and greener usually within 6 months. Under Pressure H2O, 2.0 Softwash non-pressure system treats them like pests not stains!