My detailer says this is an issue with all OEM paint jobs.
The best solution is to apply a sacrificial coating to protect the paint. A solid wax job will help, but even better is something like Opticoat or Wolf's Hard Body.
2014 ///M5 Individual Frozen Grey, Silverstone Full Merino, Piano Black, Exec Pkg, Drivers assistance plus, LED Pkg, Bang and Olufsen, 20" 343M Forged Alloy Wheels
Countermeasures: Bel StiR+, Laser Interceptor Quad HP, Zaon MRX
Upgrades: Eisenmann Sport with M Performance Carbon tips, Dinan anti-roll bars