Originally Posted by mikenap
Here's your answer. Unless you go mudding in your M3, an Optimum No Rinse wash is a safe, effective, inexpensive and quick way to wash your car. Used correctly, it is no more likely to cause swirls than a traditional wash.
Here's my baby. Over a year since any correction was done, and strictly ONR washed CAREFULLY in that time. I love the stuff, couldn't live without it.
I use ONR occasionally. It really depends how dirty the car is. If your car is daily driven and covered in dirt, mud and/or bugs, you can not ONR. Even with ONR pre-soak, it will mar the surface.