I have been real happy with Armor All Extreme Tire Shine Gel, in an orange plastic bottle, with a foam applicator.

Wash the cladding to remove all of the dirt and grime. Then it takes about 10 - 15 minutes to apply the gel. It leaves the cladding with a nice wet black look that stays for days, or until a hard rain. It then just looks black for a few months. If you live in a dusty area, the dust will stick while in the wet black mode.

The gel also does a good job on the hood insert and side mirrors.

Regards,
Henry