The elimination method of small yellow spots on white cars is as follows: 1. Wipe with oil. Choose transparent and viscous engine oil, rub it on the rag to remove rust, and then wipe off the residual oil on the car body with a soft dry rag. 2. Use automotive paint iron powder remover. Automobile paint iron powder remover can quickly dissolve paint iron powder, oxide layer and other substances, which can be purchased online or in automobile maintenance places. 3. You can use volcanic mud. Volcanic mud is also called car wash mud. When in use, volcanic mud must soak in water to soften the body, and keep the body moist while wiping. Then spray water on the car body with a watering can to clean the car body.