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Personably I've went for a self applied hand polish followed by a liquid wax (autoglym products) - circa $50 of materials and a couple of hours of my own time. I wash the car myself - rinse off before wash and 2 bucket method.
I could see me going for ceramic etc if I had a super car but think it's hard to justify on an X5...to each their own though!!
Good luck.
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