1) Chock up front wheels
2) Jack rear up and put a jackstand on only one side of the rear jackpoint so that one wheel is free and the other wheel is on the ground
3) I suggest removing the tires and valvestem, it'll make your life much easier
4) 2 nice layers of blue painters tape on theface of the wheel to that accidental "Opps" does not create an "ow"
5) Start the car up and put into drive so the lifted wheel spins freely
6) Get your 60-80 grit sandpaper and press firmly on the rim while spinning (it heats up so gloves might be a good idea). Also I had some 4x6 inch sheets of nice squared aluminum on hand and I used those to litterally shave off most of that rubbery plastic clear like a lathe and chisel technique, note that the aluminum is just as soft if not softer than the aluminum rim so you run very very little risk of putting deep scratches the rim . That clear stuff is super durable, and pain in the @$$ to sand off so shaving it off is a good way to save about 20min of cursing per wheel.
7) Once your down to the aluminum (you'll see the sheen/color difference) Hit it with 180, then 220, then 320, note that the car is in drive and the wheel is spinning throughout this whole process.
8) I have an air grinder with a buffing wheel and compound that I used to take the 320 down to a pretty nice shine easily so sanding with 400 wet, 600 wet, and so on might be another option without the buffer.
9) Then I took some "neverdull" and pretty much finished them off.