CARWASH!!NO!!!If you love your fluid grey paint that much don't put it through a car wash,it will ruin the paint finish.
As Richcy says it will impart swirl marks that dull the shine and can only be removed by machine polishing.Even the "hand wash "stations are just as bad,they use sponges,chamies and blades which all damage your paint.
Only use wool wash mitts and the 2 bucket method and dry with amicrofibre.
DS4 DSport THP200