In order to prevent rust when the bearing leaves the factory, anti-rust oil is generally applied on the surface of the bearing, and the mixture of anti-rust oil and grease will cause the grease to deteriorate, so when we disassemble and use, we must first clear the anti-rust oil, and rough washing. Avoid rotating the bearing as much as possible. Use a brush to roughly remove the attachments on the bearing. When it is fine, you can gently rotate the bearing to clean it. The cleaning agent must be kept clean. After cleaning, dry the bearing and fill it with grease.