i use what ever i can find that is cheap but then i spend big money on this additive because i think it works better than rainx
http://www.dvelup.com/Cart/index.php...roducts_id=114
the only reason i dont use straight water is because it freezes.
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Enjoying an E89 Z4, F30 320i and Fiat Abarth //
E85 Z4 (sold), E82 128i (sold), Fiat Pop 500 (sold)