Depends somewhat on if they are originally painted or if they are powdercoated? Sandblasting them will work ok on painted rims but I believe a chemical process is used for best removal of powdercoating. Don't know what the asking price is but by the time you pay for the rims, sandblast or whatever then paint or powdercoat them you may be close to spending the same amount of money you would if you just buy new. Better yet with new you can get the polished lip and the color of your choice.
You see what you want to see and you hear what you want to hear.........