I have had a CBN for many years now and have sharpened 100's of chains. While they do clog from filthy chains, a quick sot of brake parts cleaner and they are like new again.
CBN can be stripped and re plated also at a lesser cost of a new wheel, although US Diamond isn't the place to have it done.
I wanted a wheel more to the profile of the raker so I made a blank and sent it to be plated. You also get to choose the grit you prefer.
Blurry pic but you get the jist.
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thanks for the input on cbn wheels. they do come with some sort of cleaning block but a dose of solvent sounds good. i my try a set next time i replace wheels. that could be fairly soon since i am using Total resin wheels at present. they don't last too long.