You need a clear/invisible bra, that's always there and simply applied on the paint. Very, very few people subject their cars to the old black vinyl/leather bras (which are bulky and can harm the paint more than they help a lot of the time).
Some links, from the CTS-V forum (a lot of these guys have done them):
http://www.cadillacfaq.com/faq/answers/clearbra.html http://www.invisiblemask.com/site.html http://www.llumar.com/na-eng/contact.html http://www.3m.com/
...and others
From InvisibleMask, here's the specific 2008 CTS pattern, as well:
http://www.invisiblemask.com/cgi-bin...LLAC&model=CTS
and also their many choices for mirror, rear bumper, etc. protection pieces.
This is the only way to have protection ALL the time and keep your front paint perfect, yet never have to worry about taking a bra on or off OR seeing it on there (aside from the faint line, with some colors). They've been a staple with many luxury brands for years, often applied at purchase, and are more than worth the cost.