Washing the car in the sunshine
Around here in Arizona, the opportunities to wash a car in the "shade" or on an overcast day are rare. So, what I've come up with is this:
I use the hose and the Meguiar's soap (plus other products like Rain-X bug-b-gone or whatever its called) to wash the car as normal. Of course, the sun dries up the (super hard) water leaving deposits. I take a towel to the body and dry off what is still wet. Then, I go over it with quick detailer to get rid of the spots.
I just go sick of waiting for an overcast day... the car was getting caked with dirt (especially after two trips home from work in the rain).
Anyway, just an idea if you otherwise have the time on a hot sunny day to wash the car.