No rubbing required. Contains no harmful acids; safe and easy to use. Removes stains from grassy marine growth, scum line and rust stains. Excellent for use on fiberglass, metal and painted surfaces.

 PROP 65 WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov