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I use Tech Wax 2.0 and have also used Turtle Ice on previous cars. The Ice product works very good on dark colors. Never take your car to an automatic car wash and follow-up each wash with spray detailer or wax. The IS car design is prone to road grime being thrown up on the sides of the car.
Why not go through an automatic car wash? I leased my 350 so long term doesn't really matter to me but obviously I want it to look really nice in the time I have it. I always thought going through an automatic car wash would prevent those annoying swirls on the car? But then again I have a ultra white version.