Remove tough waterline stains.Extremely effective at removing tough waterline stains, this biodegradable cleaner meets strict EPA/DfE requirementsand is a safe alternative to harsh acids, phosphates, or other caustic cleaners. Follow up with Pure Oceans NanoTec Paste Wax.Key featuresBiodegradable formula meets EPA/DfE requirementsCleans stains and rust from hullsSafe on fiberglass and paintAlternative to harsh acids, phosphates