The description is easy to understand and I led the steps for "severe contamination" in succession: I put the print head in a plastic box, which was slightly larger than the print head so that the nozzles were completely in the liquid, I but not too much liquid for required. After 5 hours, I renewed the liquid and placed upside down again for 5 hours in the liquid. Then I let the head dry on a paper towel and put it back on, straightened out the print head and prints it again as if nothing had happened.
Since I still no name printer ink use, I now - thanks to nozzle fit - can apply even more so with a clear conscience, I thought to myself, I buy a stock package nozzle fit, then I can clean my two printers on a regular basis and am printhead problems once and for all here goes.