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It's not a good idea to wash it now because there is still salt (in solid or mixed in liquied form) on the roads, even if the snow melts and it rains. Some say it's because it's not warm enough for rust/oxidation. How I see it is that if you wash it today, even if it rains, you'll still get salt on your car. It's not really the salt that causes the rust - it's the moisture trapped next to the metal. The rust forms mainly because of the dirt that is built up in the fenderwells, wheelwells etc - they trap moisture and if salt gets mixed into it, it accelerates the rusting. Imo, the optimum time to wash is a couple days after the temperatures rise and the city stops salting the roads, and after the rain has washed away some of the salt. The most important thing is to wash away the dirt in the non-visible areas - that's where we're most worried about rust occuring.
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