After you water sheet your car, spray it down with a quick detailer (I have been using Meguairs Ultimate, but any will do). Not only does it make drying easier but it will also leave your M3 looking spotless. Picked this trick up (most of you may know it) from the Adams car wash website detailing series.
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2006 E46 ZCP Mystic Blue M3. 2008 E90 SSII M3. ///M
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