The Ex-Con Automotive Concrete, Rust, Tree Sap, and Scale Remover is an effective and gentle compound of non-fuming, acid cleaning agents that penetrate and remove difficult stains that have been bound to your vehicle. While concrete, tree sap, and rust blemishes present a danger to the health of your vehicle’s surface, Ex-Con will safely remove these substances without damaging your paint. Make those nasty and sticky stains disappear and restore your car to glory!