Doesn't your car see "rain" every time it gets washed?
Seems like a moot point unless you live downwind of a nickel smelting operation when the rain starts.
My tap water is more residuey than rain but you can dry the car and polish it up regardless.
Besides the car looks gorgeous with the rain all beaded up on it. Picture a glistening moist supermodel... nice right! You ought to see what your missing. 
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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