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Duke,

I concur with the "more lapping" suggestion. Lapping removes a layer of the hone, so unless you've got some incredible alien stone-penetrating stain there, lapping will eventually take care...

I usually notice more buildup when I use tape, which I always do these days. Especially if you're using some pressure it does tend to build up on the edge of the stone.

Either way, it doesn't...

Duke,

Did you use a green Scotch Brite pad? I tried the blue ones and they didn't do it...

I can pretty much get mine white with the green pads. But if that doesn't work, get your sandpaper out...