I tend to do a one step correction once a year, when the weather gets nice again.
Until then, if it gets nice enough I do a quick coat of einzette polish wax that hides a lot of that stuff and top it with another coat of einzette glanz wax.
Mine is no show car by any means but people routinely ask me if it's new, despite 125k miles.
330i ~ BMW Perf. Susp. ~ M3 Front susp ~ BMW Perf Exhaust ~ 3.38 lsd ~ SF71 Alf CSL reps ~ Pilot Super Sports ~ AA Tune ~ 335is front brakes WTB: e93 M3 Front Sway Bar