ARMOR'S Metal Rescue protective packaging is a non-toxic liquid solution that is water-based, and safe for aluminum, brass, copper, chrome, gold, lead, nickel, silver, titanium, tungsten, and solder points. It completely removes rust, from in as little as 20 minutes, to at the latest, 24 hours. Because it contains no toxic or hazardous materials, it may be disposed of in a city sewer.