I've had that problem. Try this. Soak a papertowel in eco-solvent. Make sure lever is down, move head out and place papertowel over black pad in capping station. Move head back over capping station, Let soak for an hour and check it.. The paper towel will draw out the black. If there's not much on there yet, try soaking longer. It worked for me, I was going crazy with it.
Good luck
Lynn