Wheel Cleaning Mousse is a safe and effective cleaner that spreads a thick mousse over every surface of your wheel to ensure complete coverage. It also expands into the hard to reach areas of your wheels to give a thorough clean. When the mousse is ready to agitate, the Colour Transform Technology will turn it red as it reacts to loosen brake dust. Wheel Cleaning Mousse is pH neutral and is safe to use on all wheel types and finishes.