Davis Instruments FSR Big Job Bottle Economical 2-liter size Best stain removing gel in the world Use on shower stalls or rust stains and cutting boards and boats Unique stain absorbing gel that serves a variety of purposes both ashore and afloat Ideal for removing oil, rust, exhaust, waterline, transom stains, and fiberglass stains Use for removing road soil from trailered boats and recreational vehicles Non-abrasive quality makes it safe to use on white painted surfaces as well as on gelcoat Size 67.8 oz.