Precision molds such as: residual toner, plastic residue, high temperature sulfide, gas residue, rust, oxide and other traditional methods on the injection mold are soaked or fired with an acid mold cleaning agent. This method can solve some mold residues. The problem, but the damage to the mold is imaginable and difficult to estimate. The manual cleaning method has been adopted by most precision mold manufacturers, but the maintenance requires a lot of labor is also not conducive to cost control. In the past two years, there has been an "electrolytic ultrasonic cleaning machine" in the country that can automatically clean the mold residue that can be known. Problems such as toner, plastic residue, high temperature sulfide, gas residue, rust, oxide, etc.