For short term protection, consider this product:
http://www.waxit.com.au/index.php?op...id=37&Itemid=1
Once my E90 was properly cleaned before I sold it, I could see the results of 7 years of city & country driving on the hood without any protection at all. I've learnt.
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328i M-Sport, Estoril Blue, Carbon XP 35 Tint, front heated seats, black Dakota, Sports Suspension, Anthracite Headliner, HUD, Pro Nav, Sunroof, hk 600w, Bi-Xenon, 19" 403M wheels, Reversing Camera, DAB+, Xenon, BT Ext Connect, MST turbo intake pipe, MST Cold Air Intake, JB4 on Map 2 with Catless DP produces awesome performance in Sport.