There are several products on the market that help cover the fading that these areas suffer over time.

A lot of enthusiasts use a product called "Back to Black" with good success. Others, like me, just use the same stuff that you'd use to make your tires shiny.

These "rejuvinating" products range from Armor-all (thin viscosity) to a thicker tire dressing. Experiment with several. You'll find exactly what you're looking for.

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2002 X5 4.6is, Black Sapphire on Black
1997 328is, Black on Gray
2003 SL500, Black on Gray
UH-1H Helicopter, Yellow