The Cortec EcoAir Graffiti Remover Enhanced with Nano VPCI Technology is a semi-viscous liquid used to remove graffiti, inks and paints from metal, concrete and wood. The liquid contains a corrosion inhibiting compound designed to prevent flash rusting and discoloration of metal surfaces after graffiti removal. To use, simply spray the product on the surface, allow it to penetrate the graffiti for 3 to 30 minutes, then scrape clean while rinsing with water. This product is packaged in an environmentally friendly EcoAir bag-on-valve spray can.