Why is there a rough, sandpaper-like patch on the car paint?

[SanReed]

Reasons for a rough, sandpaper-like patch on the car paint: It may be due to the presence of many harmful substances on the surface, causing the paint to feel rough. It is best to use a clay bar for removal. Below are the steps to clean the car paint: 1. First, rinse the dirt attached to the car body with clean water or car wash soap; 2. Then, use a clay bar soaked in warm water to gently wipe the paint while spraying water. Avoid using too much force, so maintaining controlled pressure is more stable. Stop the operation once the surface becomes smooth again; 3. Apply a layer of wax to the car. Waxing not only protects the paint but also enhances its shine.

[Hubert]

I've been driving for over a decade and encountered this kind of matte paint surface quite often. It's likely paint oxidation – prolonged exposure to UV rays loosens paint molecules, just like the rough texture on my old car's hood. It could also be dried bird droppings or tree sap residue that wasn't cleaned properly, forming a gritty layer. I recommend first washing with automotive-specific cleaner, then applying wax. If that doesn't work, polishing may be needed, but be gentle to avoid damaging the original paint. Prevention is actually most crucial – regular washing and waxing can avoid these issues. Safety first, never neglect it.

[DeAdriel]

I was shocked to find a matte texture on my newly purchased car not long after. It was probably caused by tree sap or bird droppings corroding the paint while parked under a tree, resulting in a rough surface. Washing with water and a soft cloth can remove most of it—just avoid using a hard brush to prevent scratches. I also checked related videos and found this is a common issue. Keeping the car clean is key, and it's best to avoid parking near pollution sources to save trouble.

[DelIsabella]

An unsmooth paint surface is mostly caused by surface dirt or slight oxidation. Stains like bug residue can seep into the paint layer over time, making the surface feel rough. Oxidation causes the paint to age and become fuzzy. Carefully wiping with a microfiber cloth and applying a layer of car wax can improve the condition. For severe cases, consider polishing—don't delay as it could worsen.