a moldable compound of the type which has the inherent capability of cleaning contaminating stains and residues in compression , transfer and similar molds , is deposited on a carrier sheet to form an uncured mat for placement in a mold to be cleaned . when placed in a mold to be cleaned and subjected to a molding operation , the moldable compound coating of the uncured mat will melt and flow into conformity with the interior configuration of the mold and cure in that conforming configuration . the cured mat is then capable of being ejected in as a reinforced unitary structure from the mold .