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Old 11-14-2012, 02:11 PM
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Gran Turismo Gran Turismo is offline
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Location: Switzerland
 
Join Date: Aug 2006
Posts: 1,352
Mein Auto: '11 Alpina B5 Biturbo
The culprit doesn't have necessarily to be a leaky pipe... if (rain)water somehow finds its way through a concrete garage ceiling via tiny cracks or cavities and ends up dripping for several hours on your car, then the result will look exactly like the OP's picture.

This happened to me once on the hood of my previous BMW. After coming home, I was able to quickly dissolve those calcium/lime-type residues with a few drops of... pure lemon juice! Yep, the stuff you'd use in the kitchen on your meals which often comes in those small plastic bottles. Squeezing a slice of fresh lemon should work exactly as well. As it's a mild acid too, its effect is probably very similar to vinegar.
Of course I rinsed the lemon juice well and couldn't spot any traces or residues later.
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