Wash w/ Dawn, claybar, Wash w/ Dawn again,
Zaino (Z5, Z5, Z2, Z2, Z2, Z6 between each coat.) You'll have a perfect finish. Use Zaino car wash from then on. and quick detail with Z6 between washes.
JMO.
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2009 328i Coupe Space Grey w/ Dakota LeatherSTEP, Sport Pkg. w Paddle Shifters, Prem. Pkg., Comfort Access, Grey Popler Trim, Heated Seats, Shadowline Trim, Xenon Adaptive Lights, GP Thunder Fogs, GP Thunder Angels, RE15mm Spacers, 35% Tint,OEM Alarm, Clear Corners, K&N, Strut Brace