[QUOTE=Stuart;6364533]I used to have a Bonneville four door just like that, same two tone colors and everything.
You may be able to clean up the roof so the existing paint doesn't look so bad. I've seen people use CLR calcium-lime-rust remover (it's sold at the hardware store for use in cleaning sinks or toilets), others have used Metal Prep. It won't look perfect but it may come out good enough for now.
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I admit that is impressive.