Check out some of the processes/products mentioned on the thread below.
http://www.67-72chevytrucks.com/vboa...d.php?t=394790
As with any aftermarket wheel, there's no real easy way of clean and go, so a little elbow grease will be needed. If you're using them on a DD vehicle, it's going to require more frequent cleaning.
Mothers Products have always done well for me.