Why Can't the Yellow Stains on the White Car Be Washed Off?
2 Answers
White cars with yellow stains that cannot be washed off are likely due to oxidation and yellowing of the white paint, often caused by inadequate paint maintenance. Below is an introduction to automotive paint: 1. Definition: Paint is a chemical mixture coating that firmly adheres to the surface of an object, serving purposes such as protection, decoration, marking, and other special uses. The authoritative book "Paint Technology" in China's coatings industry defines it as: "Paint is a material that can be applied to the surface of an object through various construction processes, forming a solid film that adheres firmly, has a certain strength, and is continuous. This film is commonly referred to as a coating, also known as a paint film or layer." 2. Composition: Paint generally consists of four main components: film-forming substances, fillers (pigments), solvents, and additives. Depending on performance requirements, the composition may vary slightly. For example, varnish lacks pigments, and powder coatings may not contain solvents.
Hey, I've been driving a white car for many years and often see these yellow stains that won't wash off. The issue comes from iron particles and brake dust on the road, especially when traffic is heavy—they float up and stick to the car's paint. These iron particles oxidize and form small rust spots, which then seep into tiny pores in the paint. Regular car wash water can't remove them, and scrubbing hard may scratch the surface. I recommend going to a professional shop to use clay cleaner, as it can adsorb the stain particles. For prevention, wax the car once a month to protect the paint film. Avoid parking under trees or in industrial areas to reduce exposure to bird droppings and pollutants. Long-term neglect can cause the entire body to turn yellow, affecting both the car's appearance and resale value.
