I honestly cannot remember the last time we washed our car. It must have been at least 3? 4? years ago. We have an 18-yr-old Honda Odyssey minivan and we live in the middle of the city with no driveway or garage. The logistics alone of the washing pretty much precludes us from doing it. But, if we had a newer car maybe we would. Eh, probably not. Just seems like a waste of water, resources, and time. It rains pretty often and that seems to clean it off just fine. I do, however, keep the interior quite clean & occasionally vacuum it out with my handy dandy handheld vacuum. I'm not a fan of crumbs.