I would take it to a competent detailer. As long as your paints not chipped or panel creased, those guys can do miracles.

I would not attempt and compounds or abrasives on your own.

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2008 BMW X5 4.8i (E70)
Alpine White, Burl Walnut, Nevada Black, Sport Package, Cold Weather Package,
Premium Package, Technology Package,
Rear Climate Package, iPod adapter