Stainless steel screen materials are stored in the air, even if the time is short, particles such as dust or grease dispersed in the air will adhere to the surface and form a layer of dirt. Dirt can be roughly divided into two categories: inorganic dirt, including abrasive particles, dust in the air and stainless steel mesh powder. The other is organic pollutants, including animal and vegetable oils, mineral oils, mixed oils, thermal adhesion and polishing paste residues. When electroplating, even if a small amount of dirt layer remains on the surface, it will cause defects such as poor bonding and peeling of the coating, so the dirt layer must be removed, which is called degreasing.