my rims seem as if they are stained from the years that the previous owner hasn't fully cleaned them. i've used a green scrubby and use a lot of pressure in the center as you can see the two different colors / layers of the rims, but it's really, i mean really hard to get off. i'm not sure if i should be doing this or what i should or shouldn't do, if anyone has any tips let me know please. from what i "got off" already in the center took about an hour.
picture is linked here:
http://img220.imageshack.us/img220/5898/photo1ir.jpg the center where i 'cleaned' it of the rims are what looks to be what it should look like