Once someone scrawled in the dust on my car, “Get a car wash!” I wrote in the dust, “I’m waiting for the rain.” They wrote back, “You cheap bastard!” I replied, “Yep!”
Unless the cleanliness of your car is tied to your livelihood, don't wash it! Wait for the rain, then let nature do it for you, for free. Whip out a pair of swim trunks, grab a towel, some soap and play in the rain. If you have kids, all the better, it is a lot of fun! If it is too cold out, then just let the rain pound on your car and run the dirt off. But never, ever, spend money on a car wash just to clean your car.