The bottom roller cooling bearing cleaning is divided into two steps: rough cleaning and fine cleaning. They are placed in the container respectively. First, the metal mesh is placed on the bottom to make the bottom roller heat-dissipating bearing not directly contact the contaminants inside the container. When rough cleaning is carried out, if the bottom roller heat-dissipating bearing contains contaminants for rotation, it will damage the rolling surface of the bottom roller heat-dissipating bearing, and more attention should be paid. In the rough cleaning oil, the grease and the adhesive on the surface of the heat-dissipating bearing of the hearth roller are removed by a brush. After the general cleaning, transfer to the fine wash. In the case of fine washing, the bearing is rotated while cleaning in the cleaning oil. In addition, the cleaning oil also needs to be kept clean.