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Might be all wet here...but that looks like pitted aluminum to me .
and looks like someone has already fine scratched it with a kitchen scrounge pad trying to clean it up
+1 0000 steel wool with an aluminum cleaner.
I use the product I linked below, probably any decent aluminum cleaner and 0000 steel wool work though.
Read his instructions.
Second Blue Magic , that stuff dissolves tar , bugs . break dust and leaves a very nice shine .. Around here it's hard to find , last time I ordered it off Amazon .
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.