Sometimes, when I see it is raining out, I go outside and lather up my car in the driveway. I don't use a hose or anything else, just a wash mitt with some car soap on it.
I lather up the car thoroughly starting from the top and working my way down. Takes me about 5-10 minutes total.
If I time it right, and there's at least 15-20+ minutes of rain after I am done, the rain will completely rinse the car clean.
If I am REALLY lucky, I won't have to go anywhere until the rain stops and the roads are dry (like last night and today). Car looks like I just spent HOURS on it.
Anyone else do this??