Piston Kleen is a safe, effective, and economical water-based cleaner engineered to remove baked-on carbon, oils, greases and other soils from tracked vehicles, trucks and automotive engine parts. Developed to remove burnt-on carbon deposit in the piston rings on U.S. Army vehicles, Piston Kleen makes easy work of a major problem. Piston Kleen is recommended for soak tanks, cabinet washers, ultra sonics, and through-put machines. Simply soak the piston/parts in Piston Kleen for 2 to 24 hours to remove even the nastiest build-up. Remove from solution when part is clean. Agitation and heat decrease the soak time, but is not necessary. Orison recommends agitation with a working temperature of 90o F. to 180o F. Note: Used pistons may have heat/stress induced wear under the carbon which may not be identified until after soaking.