An immersion cleaner that will disintegrate the sand or resin (isocynate) bond of sand casting. The primary function of PARCOR 90 is to rapidly penetrate and remove the built-up cured sand deposits in the vents and ports of core casting boxes that prevent the proper dispersion of the sand or resin into the re-casted mold. PARCOR 90 also has a detergent built in to help remove grease and oil deposits that might interfere with mold adhesion and curing.