I never use any circular motions when I wash or quick wax the car. Of course I'll probably end up with a checkerd pattern rather than swirl marks but who knows I guess we'll see. I read a really good post in the detail section about washing a black car and avoiding swirlmarks and I follow some of that. And yeah the bumper does collect dust after about a mile or so but oh well thats what the cali duster is for. either way She does Look Mean as hell!

 

The Zaino and Z6 spray is awesome. It makes the car so water repelant that the suds from the car soap just runs off the car. I too noticed that when it's dirty, it doesn't really look dirty...unless you look upclose.