SONAX Wheel Cleaner Plus is the latest formulation for fast and effective removal of stubborn brake dust and road grime. The powerful wheel cleaner is 30% stronger and works much faster than SONAX Wheel Cleaner full effect. PLUS sprays on clear and turns red almost instantly as it begins to work. Because it is acid-free, Wheel Cleaner PLUS is safe for use on all wheel types and will not damage or corrode wheel bolts.