wash 1x every 2 weeks during good weather, 1x every 3-4 weeks during bad/winter. Going on spirited drives on weekends gets the car pretty dirty (bugs, dirt, mist, dew dropping from trees) so never really does stay clean for more than a week. I'd feel like washing my car a lot more if it were a Porsche/higher end sports car, but the M3's more utilitarian and practical nature allows one to let go a bit more and not feel bad about it.
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