What's the best way to clean up this rust? (pics)

Metal rescue or other rust dip products. There is a youtube video where they are at a swap meet and drop guys rusty parts in for demonstration. Damn that stuff is a rust killer!
[ame="http://www.youtube.com/watch?v=ZiSLvmKmKng"]How to remove rust from a rusty fender - YouTube[/ame]