I hand wash even in the winter... There are a number of "no rinse" washes out there: Optimum No Rinse (ONR), and Protect All Quick and Easy wash (QEW) that you can use by bucket in the garage... As long as it's above freezing they work fine and with some heat in the garage, it's not bad at all, even in Buffalo.
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E46 325xi Oxford Green/Sand Leatherette/Myrtle Wood Auto ZCW - Retired
E90 330xi Mystic Blue/Black Leather/Aluminum 6sp Manual ZSP/ZPP/ZCW/CA - Retired
F22 M235i Mineral Gray/Red Leather/Aluminum 6sp Manual ZPP/ZTP
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