Nighthawk. It really does not look that bad. I bet with a good wash, clay and perhaps compounding that would come right back. I would start with Dawn, or some heavy cleaning soap and a very high pressure hose. Then follow with an aggressive Clay and polish the paint back up. Let us know what you do and how it comes out.
What i do everytime i wash my car is go around all those types of area's and make sure to dry them door jams under the doors. Under the hood. Ever since i started detailing cars ive been doing this. Its a great way to not let that type of gunk develop.