Meguiars Ultimate All Wheel Cleaner delivers our most powerful cleaning performance that is also safe for all wheel and brake finishes. This advanced chemistry blends road grime attacking surfactants with active brake dust dissolving agents. The deep cleaning gel formula turns brake dust purple and road grime brown as it gently loosens stubborn contaminants. And since it is acid free and pH balanced this wheel cleaner is safe and effective for all wheel finishes and painted brake components.