I have to say that I've never had alloys that get so black so quickly as my B Max titanium wheels. It doesn't help that the spokes are so close together either. I've used the alloy wheel sprays, which do a good job, though found pressure washing as effective. Just concerned as to whether pressure washing may cause damage to the valves and tyres over time.
B Max Titanium X 1.0 125 bhp in Magnetic with built in SatNav and rear sensors.