I agree with JARblue and schellingr. It's good as a pre-wash when the car is very dirty but not something you want to do all the time. As per JARblue, use the most gentle settings with the fewest chemicals (ie, just a good rinse) and follow up with a proper cleaning. See Junkman2008's paint care videos for some great tips. Edit:
Junkman2008's threads Edit 2:
The Junkman answers your question