PJ1 Professional Line of environmentally safe shop chemicals all contain non-chlorinated solvents that wont contaminate motor oils. PJ1 Professional Carb & Choke Cleaner is designed to clean, degrease and remove varnish and other contaminants from motorcycle carburetors, passages and components. Easy Spray Formula saves time and is easy to use. No flushing or water needed. Not harmful to rubber, vinyl or neoprene.