Cleaning some bolts... not sure what to do... Keep them, get new ones?

Before

After degreasing in Simple Green and a soak in POR-15  Metal-Ready.

The brighter ones were lightly hit with a brass wire wheel on the bench grinder. Not sure sure if I should replace all the bolts, paint them, get them plated or just go with the wire wheel. Cleaning them was fairly quickly, so I'm not worried about the time. I just don't want them to rust 2 seconds after they go back on the car... I think some of the original coating is left so they might be ok....?? Any ideas??