We have a Fiat Punto and a Volvo V70 .. both front disc brakes. The Volvo wheels clean up fairly well with a bit of elbow grease (on it's 6 monthly wash) but the Punto .. no chance. The alloys are dust stained and I can't shift a gram of it. Anyone know of a chemical I could use or any tips? I'm not a car buff at all .. but the wheels look a mess. Thanks.