Environmentally-safe water-based product that removes rust in minutes, without scrubbing. Non-toxic, non-corrosive, safe on skin. No fumes or bad odors, non-flammable, no VOCs. Biodegradable, water soluble, can be disposed of safely into sewer. Will not affect plastic, PVC, Viton and most paints. One gallon de-rusts up to 300 pounds of heavily rusted steel. Immerse the rusty object in the solution and leave it for 10 minutes for light rust or up to overnight for extremely heavy rust. Made in the USA.