A little off tangent here perhaps, but would anyone have tried or recommend auto-dry products like this:
Mr. Clean Auto-Dry Carwash System, Proctor & Gamble MCC0AA -2 Pack : MCC0AA - Buy.com

It isn't much of a chore to wash a small car like like the XF, but auto-dry features could allow more time for the finer details like wheels and interior. It would also motivate for less interval between each wash. If it truly works, that is...