Digital BW, The Print

Most likely there isn't enough built up on the heads to bother, but 
here is what many will do...

Get a non shedding wipe of some kind, Twill wipes work well since the 
don't snag or shed and fold it a couple of times. Saturate with 
windex, and then move the heads over the wipe and let rest for a few 
seconds. Yes you will fight with the wipe until you get the proper 
amounts folded so it fits. You could try putting the head height on 
thick media, then move it over the wipe, then lower the height and 
keep it lowered when you move the head back to park. A more simple 
way would be the saturate the capping station (where the head parks) 
and let it sit for a while(minutes to hours), check to make sure 
there is plenty of windex and repeat. When you turn the printer back 
on, it will clean like normal sucking the windex/old ink down into 
the waste system. Print a nozzel check to make sure things are 
working, and try another print. If you still have out of place black 
dots, then that might be something with in the printer on the driver.