I've noticed that a lot of stuff gets stuck in the holes of the perforated leather. I just use a small safety pin and push it into the seat so that the holes look clean.

I got chocolate stuck in there once and dabbed a bit of leather cleaner on the pin. Got it out that way.

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2008 X5 4.8
White w/ Black Interior w/ Bamboo Trim | Premium | Sports + 214" | Tech | Cold Weather | Rear Climate | Premium Sound | Active Vent Seats | Heads-Up | Comfort Access | 3rd Row | Aero Kit | Huper Optik Tint | Clear Reflectors