If they aren't chipping or pealing, try kiwi leather dye...black. I'm serious...it works on other black trim. Apply it with a rag and not the little spong applicator on the bottle. I bought a bottle at Walgreens and used it on my wife's V70 black trim. A year later they still look great. If you spill any on the paint, get it up quick. Harder to get off later. Good luck!
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.