| If there really bad.
1, get a decent dedicated wheel cleaner, give a wheel at a time a good soak leave for a minute, then agigtate with a brush or cloth. Rinse.
2,use a clay bar as mentioned, spray the lubricant on the wheel and then use the clay as described n the wheels.
3 if needed use the wheel cleaner again.
That should bring them up good as new and save you £50 per wheel on a refurb.
To keep them looking good, wash them regulary and give them a coat of wax which will make them easier to wash each time.
Scott | 
