Wheels cleaners are usually pretty effective at removing the dirt and grime that is baked onto the wheels of a car. Typically, wheels are the dirtiest part of a car because it is located so close to the ground and and is constantly being bombarded with brake dust coming from the brakes. Add the fact that the wheels are always exposed to the elements and are always exposed to heat from the brakes, and you have a recipe for hard-to-clean wheels. Griot’s Garage sells this wheel cleaner called Heavy-Duty Wheel Cleaner that is acid-free and safe, yet is very effective at cleaning very dirty wheels.