I can tell you what not to do. I tried buffing it out with white polishing compound on a buffing wheel attached to my bench grinder- the same technique I have used with great success to polish my aluminum parts. Came out nice and smoothe and shiny, but the heat generated seemed to produce a delayed reaction that bleached a lot of the black color out of the plastic in irregular blotches. I ended up going on E-bay and getting one off a parted out bike that is in decent shape.