Those things are alright in a pinch like everyone else has said but I have noticed around where I live in Indiana the car washes leave like a soapy residue that you can't see but when you go to wash your truck by hand like a week or two later you will get soap coming off of it when you are just hosing it down. That kinda bothers me everytime I do it. I don't think its to good for that stuff to be sitting on my paint in the sun and everything else.

 

I would suggest getting some Poorboy's Spray & Wipe, and some large, plush MF towels. After you've run it through the wash, drive it for a little bit to remove most of the water, and then wipe it down with the S & W and the MF towels. Works great!