Minor swirls (from washing and such) are actually less of an issue on the frozen colors because your eye can't detect them. So you pretty much just wash, dry and go as some of the others have said. There are some waxes made for the matte finishes (I know that Swissvax makes one) but I don't know how necessary those really are.
What would concern me most with a frozen finish as a daily driver are chips, since you can't touch them up. With chips or deep scratches, it seems you have to live with them or do a full panel repaint. The matte clear bra option sounds like a pretty good idea for a daily driven frozen vehicle.
2015 ///M3 | BSM/Full Black/CF | DCT | Silver 19s | Executive | Lighting | DAP | Adaptive Suspension | HK | Enhanced USB | Tint
Past BMWs: 2014 550i, 2013 M3 ZCP, 2012 535i, 2011 E90 335i, 2009 E90 M3, 2008 X5, 2006 330i, 2004 330i