Meguiar's most advanced wheel cleaner ever. Innovative gel formula holds longer for a deeper, more effective cleanse. The powerful mix of surfactants that attack road dirt and active brake dust dissolvers, turns brake dust purple and road dirt brown, as it gently loosens these stubborn contaminants. Unlike other wheel cleaners that change color, there is no awful smell. And because it is acid free and pH balanced, it is SAFE ON ALL TYPES OF WHEELS!