Con-Klean is a government strength cleaner and stain remover. It completely restores the appearance of your concrete by removing all grease, oil, dirt, and even chewing gun residue. Con-Klean removes oil stains that have been there for years. Simply dilute it 30:1 with water, spray it on the stain, let it penetrate for 5 minutes, and it lifts away the entire stain, which can then be easily rinsed away. You'll get that bright, freshly washed look without all the effort.