id suggest washing the rims with a brillo pad or using scotch brite rotary wheel. If you'd like to get a higher quality shine then you may want to sand the rims up to about 600 grit. From there you'd want to start with brown rouge and yellow wheel. For further polishing you can go yellow with green rouge and finally white wheel white rouge. Another suggestion is to use a lower rpm motor. About 1725 would suffice as the higher rpm motors tend to heat the rim too much which won't allow the rouge to do its job.