These things are leaving me befuddled.
I'm using fabercastell polychromos. It seems like every time I use the blender marker, I have to go buy a new one because I can't get the color from the color pencil off of the marker. I've smeared it on clean paper, I've even tried washing them. I've gone through 5 of these things since I got my polychromos, and this is getting kind of expensive.

Am I just not cleaning them right, or is this some problem that's commonly known with the oil based CPs?
Just for reference, the clear blender marker is the thing that blends them the best. The wax blender pencils with oil based CPs is a real pain in the butt.