My Santa Fe has exterior plastic trim along the wheel wells, bottoms of the doors and around both bumpers. It is similar to the trim on an Explorer Sport (and other cars I'm sure):

I hadn't had a chance to wash the car in a few weeks with all the rain in Houston recently, so yesterday, I noticed that there were white mud spray streaks on most of the wheel wells and door trim. I washed the car but that didn't do much. I then used a ton of Armor All that seemed to get a lot of it off with heavy scrubbing, but it's not perfectly clean.
Any tips on cleaning it? Any tips on a treatment to keep this from happening again?

I hadn't had a chance to wash the car in a few weeks with all the rain in Houston recently, so yesterday, I noticed that there were white mud spray streaks on most of the wheel wells and door trim. I washed the car but that didn't do much. I then used a ton of Armor All that seemed to get a lot of it off with heavy scrubbing, but it's not perfectly clean.
Any tips on cleaning it? Any tips on a treatment to keep this from happening again?