Plain old Hoppes' will remove it, no different than brass smear.

Cool, thanks. I'll start the scrubbing process tonight. :o

So how do you like the HiViz sight? I'm ready to change mine on my DW because need somethIng more visible due to aging eyes! I've tried a gold bead front and it's ok in daylight but dusk not so much . I don't like the orig. nite sights, very hard to acquire. I haven't tried the FO type sights.

I love the Hi Viz sight. I can see it so much easier. And I also changed the rear sight to this: http://stores.homestead.com/KenSight...sh-/Detail.bok
So now I can see a fluorescent green dot in the middle of two white dots. Much easier on the eyes than black on black.
My only complaint about the Hi Viz is that is isn't contoured to the slide. It's more squared and isnt as aesthetic as the original sight. But I'll trade that for visibility anyday.