RoofDefender prevents damage to and extends the life of your roof. Our proprietary formula safely removes stains caused by algae, mold, mildew, and fungus, as well as preventing stains from returning with annual application. RoofDefender can be applied to almost any exterior surface for excellent results on both commercial and residential facilities. RoofDefender works over time with the natural elements to remove stains, as rain, wind, and sun all aid our product in the removal of biological growth. RoofDefender does not contain any harsh chemicals or phosphates and is safe to use on all roofing materials, stucco, siding, pavers, concrete, and near all types of landscaping. Green algae stains will be removed in approximately 1-3 days after initial application. Black stains will be removed approximately 30-60 days after initial application.