Face it: We live in a desert. Hence, washing the car regularly is as pointless as sweeping the dust off your porch: It's just gonna get dusty again, my friends, and all that water you just wasted could have been saved for thirsty orphans. You wouldn't want orphans to go thirsty all because you wanted your car clean, now, would you? Which is why the best car wash in Tucson is the monsoon season, especially an active monsoon season: Park your car where it will get the most action, and let Mother Nature scrub and shine your ride. It'll get dusty again, sure, but have no fear: The winter rainy season usually starts around December.