Envelope stains for maximum cleaning power.Safe, easy to use gel formula sticks where applied and clings to the surface for maximum cleaning effectiveness. Covers stains, then penetrates and dissolves them. Formulated to remove tough stains, including rust, dried fish blood and leaf stains. Effective on all fiberglass and painted surfaces and ideal for vertical surfaces. Does not contain harmful acids.Key FeaturesCleans scum lines and stains on boat hulls easily and effortlesslySafe-For-Use on fiberglass and painted surfacesNo rubbing or scrubbingGel formula "sticks" to vertical surfacesNote: It is recommended that you wear protective gloves when using this product.