The Magic Sponge and Scrub Xtend is the perfect tool for reaching and eliminating annoying black marks and scuffs on your boat or RV without the strain of scrubbing on your hands and knees. Whether it's black shoe marks, rub rail and bumper scuffs, or even marks left by dragged hoses and equipment, the Magic Sponge + Scrub Xtend eliminates these quickly and easily. Use with a cleaner or soap to amplify cleaning effect. Great for fiberglass/gelcoat, vinyl, and plastic.