Bought this stuff at a local HD dealer and have to say it is pretty impressive stuff. Just wipe it on rub gently and the blue/gold color is gone! It's no mirror shine but it takes the crap right off the header.
Blue job works great on single tube chrome header/pipes and Bassett boat headers. It also works great on 03-05 Buell headers 06 and up are made from a different metal so it turns them more brown.
I have looked at pics here with people who have used a green scotchbrite pad along with WD-40 to lubricate it and cleaned up some really dirty pipes to look like new. I haven't tried it yet on my 07 but plan to if I ever get some free time.