Auto Rae-Chem Cherry Bomb is a high strength iron fallout remover with a colour-change formula that does something no ordinary wheel cleaner can — it shows you the contamination. Spray it on and the product turns deep purple as it reacts with embedded iron particles, bleeding down the wheel wherever there's fallout to dissolve. When the bleeding stops, the job is done. Those iron particles are what make wheels look permanently dirty no matter how hard you scrub — brake dust bonds into the surface and normal shampoo simply washes over the top of it. Cherry Bomb dissolves them chemically instead, with no scrubbing and no risk to the finish. pH neutral and acid free, so it's safe on painted, powder-coated, polished, anodised and diamond-cut wheels — and on paintwork, so it works just as well as a fallout treatment on bodywork before polishing.