Hi Wayne - your advice on being sparing with power cleaning is prudent; however a couple of points on this: we don't know which printer model the O/P is using. If it's an SC-P5000, there are three cleaning choices: Normal, Heavy and Powerful (in the Admin menu). One always progresses through them if the lighter touch doesn't work. On other models there may be only Normal and Powerful, so if Normal isn't working, then Powerful can be used, but sparingly. If it is used with purge printing and not done more than three times in a day, it shouldn't introduce more problems. Whether the blockage of ink is caused by air in the lines, a damper obstruction or dried ink/dust on the printhead, the common solution - and based on what Epson techs have told me, the only real solution is running ink through it, unfortunately - but doing so as lightly as one can get away with and allowing the printer to rest overnight after a few unsuccessful cycles.