Hi, Our C and LC nozzles are clogged, to the point of not seeing blue in prints any longer. We cleaned the print head and wiper according to the video provided on your website with piezo flush. Afterward we did a cleaning, and the results of the nozzle check showed a significant difference in clarity of all the nozzles, except the C and LC. They were unchanged. I then left a paper towel with piezo flush under the print head for 24 hours, did two cleanings, and a power cleaning, and the results are still the same. I am wondering if the next step is to try getting a piezo flush cart and try cleaning the line, or if I should continue trying to clean the head. I've attached a picture of the nozzle check. Thank you.