Pro-J. This is the professional strength version of Pedro's popular Oranj Peelz citrus degreaser. Developed with the help of top pro mechanics, Pro J is more viscous than other citrus solvents to work longer, and opaque to see where you put it. Pro J lifts off the most stubborn grease from a bike's drivetrain without hurting the environment. With a stronger concentration of chemicals found naturally in oranges, Pro J can be diluted with water for a general bath of all bike parts or used straight-up on the tough crud built up on chains and derailleurs.