I hand wash only, none of my cars have seen a car-wash. Once a week in the summer and maybe once every 2-4 weeks in the winter.
I detail/seal the paint in the fall and try to get it to last the entire winter.
Straight lines are for fast cars...turns are for fast drivers
'04 M3 - track
'06 650i Cab - daily driver
'02 Highlander - kid hauler
'01 330Ci - winter beater