PJ1 Professional Line of environmentally safe shop chemicals all contain non-chlorinated solvents that wont contaminate motor oils. PJ1 Professional Contact Cleaner removes carbon and contaminants from spark plugs and electrical components. PJ1 Professional Contact Cleaner can be used on just about every part where cleaning/degreasing of metal surfaces is required. Cleans and degreases in one step, evaporating quickly, leaving a clean dry surface. Multi purpose cleaner has 1,001 uses. CALIFORNIA COMPLIANT.