Touchless washes are relatively benign for the paint. The problem is during drying. Water pressure alone will leave behind small particles on the paint, especially if the car is really dirty. These will get caught up in the towels while drying and lead to swirl marks. If you have to use a touchless wash, it may be better to limit the drying to high pressure air. It won't get all of the water off, but will prevent surface contaminants from getting dragged all over your clearcoat.
I realize the above may be a bit OCD, but it's true and I am OCD about paint.
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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z
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