Use McGuire's clay bar. It comes in a kit and is basically a piece of clay about the size of a bar of soap. There's also a spray that comes with it. You basically wash the car, then do a section of each body panel at a time by spraying the solution and rubbing the paint with the clay. Once completed, wash the car again and then give it a thourough wax job.

The clay bar is great for removing all kind of contaminants and blemishes from the paint, but it will strip off all of the wax, therefore you need to wax again.
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96 850 GLT 5-Speed- Sold due to astronomical repair costs.