Does anyone have a solution for how dirty the back end of the car gets in winter weather? would mud flaps help? is it an aerodynamic issue - what is the fix?
The easiest way to keep it clean is to clay bar the rear of the car (if your not to concerned with the rest) and if your worried about swirls or scratches, polish them out with a mild polish, then give it a good coat of wax or synthetic sealant. If your not to concerned about swirls etc, just wax after you have clay bared the car.
The sealant will help prevent dirt and contaminants sticking to the paintwork and make it easier to wash off. Don't forget, use the two bucket method when you wash the car.
Also consider a pre wash product like Snow foam (not sure what its called outside of Australia) as the foam drags the dirt off as it drips off the car and makes washing a lot easier.