Consumer Reports tested 5 exterior car trim cleaners.
http://www.consumerreports.org/cro/m...ners/index.htm
I've only tried Mother's Back to Black on my Ford Escape's black trim. Agree with CR, it looks good for a only a few weeks then needs to be reapplied. Like Meguiars Ultimate Black it's mostly silicone oil.
Going to try 303 Aerospace Protectant next. It does not contain any silicone oil.