I use the following all the time,
http://www.detailedimage.com/Leather...-P64/32-oz-S2/
Once a year do this
http://www.detailedimage.com/Leather...-P65/32-oz-S2/
Piece of cake to apply and remove on the prestine clean. Check out how the platinum interior looks after application and removal of the prestine clean. Also see the steering wheel restored to original luster. I have the prestine clean on an platinum M3, black interior R8.
http://www.flickr.com/photos/tekdesi...7628021216722/