The owner's manual says you can use those automatic places, but it says to try and find the ones with cloth strips rather than brushes, or use the touchless ones. It didn't mention anything bad about the soap/wax used at them. It does recommend using BMW products when you do it yourself, but that is probably just promotion of their products.
2008 Sparkling Graphite 535i
2009 Land Rover LR2
2003 Porsche 911 Turbo (SOLD)
2006 Jet Black 325i (SOLD)
2001 Bullitt Mustang (450rwhp - SOLD)