What can excessive dirt on a vehicle lead to?

Excessive dirt on a vehicle can lead to increased vehicle maintenance costs and reduced fuel efficiency. When a car is covered in dirt and grime, it can cause the paint to deteriorate more quickly, leading to costly repairs and repainting. Regular cleaning helps maintain the vehicle's exterior, preventing damage that could result from dirt particles scratching the paint or clogging important mechanical components.

Additionally, a dirty vehicle can negatively impact its aerodynamics. Dirt buildup can create drag, making the engine work harder and reduce fuel efficiency. The added weight of dirt also plays a role, as it can affect the overall performance of the vehicle.

Therefore, the answer encompassing both increased maintenance costs and reduced fuel efficiency accurately reflects the consequences of excessive dirt on a vehicle.