Lots and lots of elbow grease, and where all the spokes come together where you can't get in between them( where all the grime collects) I used to spend HOURS, with toothbrushes, special little strips of cleaning material ( just for wire wheels)and would sit there and clean and clean and cry and cry, cause after all that time it still didn't look good, it looked better but not good! And after you get caught in the rain, OMG.... you might as well figure 3 days worth of cleaning and then some! Thats why mine is hanging on the garage wall!!