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STONER "Trim Shine" is a great product to use. You can spray it on and wipe or you can spray it on and leave it, which I now do and it looks great, does not collect dust nor is it greasey. It also covers up any wax that accidently gets on any trim.
I'll add a +1 for Black Wow as well. I just got mine last week and applied it yesterday. Very nice results. Earlier in the week I had practiced on a Plymouth Grand Voyager with a sea of black plastic. Between the two vehicles, I've still barely used what is in the bottle - maybe 10% - and I think I was probably going a little too heavy on the van. So while expensive, looks like it will last me a long time.
FlyingZ.
Though some of the products above are great,
I use multiple tire black sprays on the tires and trim
When I wash the car, I spray some on a paper towel and hit the trim.
It wiped out Zymol(car wax that touched the trim)very easily.
Since I wash every 1-2 weeks, I hit the trim often.
I haven't seen a single Mini with the black trim terribly faded or discolored yet.
However, I've had other cars where this eventually became a problem and I used this and was very happy: http://www.griotsgarage.com/product/...rrivals&page=1