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When I had my Boxster, I had the same issue on my Savannah Beige rollbar trim. I think it showed better on the Beige than other colors. It cleaned right up with a vinyl cleaner, but would reappear in a month or two.
My 'Aha' moment came after I cleaned it one weekend where I also replaced the Brake Pads. One week after cleaning it, it was dirtier than it had ever been.
The aerodynamics were pulling Brake Dust through the rollbar. Front? Rear? Take your pick.
I swapped the oem pads for some low-dust ones and problem disappeared.
Cheers!
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