Why Wheel Arches Get So Dirty Wheel arches are constantly bombarded by everything the tires kick up from the road. Depending on driving conditions, they collect: Because they sit directly behind the wheels, airflow and tire rotation force contaminants into tight spaces where they stick and accumulate. Over time, this buildup becomes compacted, especially if it is left to dry repeatedly between washes. A common mistake I see is assuming wheel arches only need attention during major detailing sessions. In reality, they benefit from more frequent maintenance than most exterior areas. Start With a Thorough Rinse Before touching anything by…