[mrgoochio]

Do a search on proper car washing using the two bucket method. It will reduce your chances of swirls, but there is no way of 100% avoiding swirls. The best way that I know of is not touching your car completely. There are techniques to do touchless car washes but it isn't exactly convient or cost friendly. There are also touchless car washes you can take your car to but depending on how hard their water is and how pressurized it is, it could damage your paint and strip your wax or sealant off. You need to make a compromise depending on how hardcore you are about detailing and the amount of time you want to spend. Swirls will happen regardless of what you do, but there certainly are ways to minimize them.