I assume you are talking about the vertical trim on the doors? One part is at the rear of the front door and the other is at the front of the rear.

The trim is supposed to be black, it was black new. Actualy shiney deep gloss black. Age and sun turns it purple and gives it that dull finish. The only real fix is replacement.

The local high end import body shop likes to replace them when painting W140's, because its an added detail that makes the car look much better.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200