Lower Control Arms/Front Springs...how to clean & coat?

[COBALT]

I'm still debating what to do with these things. I ended up soaking them in degreaser, and scrubbing them, but there's still some surface rust and other junk that could come off. The springs are simply too hard to clean well with a brush. Should I take them to the machine shop and have them blasted in the furnace? Sandblasting? Maybe a chem-bath?

Also, how do I have them protected against rust? I thought about having them powder coated, but how would the springs hold up? They're too much of a pain to paint, because springs are just the way they are, and the control arms have those spot welded housings on them that look like a ***** to get paint into the insides.

What should I do? What's been done before? I need a solution this week...