TRcheologist said:
Any specifics you can offer regarding your use of brass wool - cleaning agents, polish, etc. - would be welcome.
I used just the bare wool on the WS frame and grille; along with a generous dose of elbow grease. It really is amazing how well it worked. I could feel the wool pulling at any dirt or corrosion, then sliding easily once the surface was smooth and polished. Unlike other abrasives, it just stopped cutting once the surface was shiny. The wool also falls apart as you use it (leaving a fine brown dust), I used most of a ball on just those two items.
On the WS, I followed up with some "Blue Magic Metal Polish Cream" that I found at my FLAPS. Don't know if it's any good, it certainly does not cut dirt & corrosion like the wool did, but maybe it will help preserve the appearance. I've used Zymol in the past, and it seemed to work well (nice because it's also for paint).
For rusty chrome, Fred Thomas has recommended to use a spray of PPG DX 579 Metal Cleaner mixed with water (4 parts water, 1 part 579) in combination with the brass wool. I tried that on the very rusty rocker cover and it did work better than just the wool. In fact I was sorry I didn't take a "before" picture, as the difference is simply amazing!
I had written the cover off as a total loss cosmetically, but since my goal is supposed to be getting the car on the road ASAP, I was going to use the rusty old cover at first. But when I finally found the DX 579 (had to go to two PPG dealers, the first didn't stock it) I just had to try it out. There's a section of the cover that I haven't done yet, I'll try to get some "before and after" of it.
DX 579 is mostly phosphoric acid, so wear gloves and eye protection while working with it. FT claims the diluted form won't harm paint as long as you keep it wet and rinse it off with water, but I haven't put that to the test, yet.