Digital BW, The Print

In the past I recall reading much about nozzle clogs. I should have 
payed more attention. I think I have my first clog. When I print a 
nozzle check the cyan bars have missing lines. I have run the color 
cleaning utility about 5 times. It still has missing bars. It is an 
Epson 3000 and refilled MIS ink. What is the best approach to fixing.