When printing large quantities of prints, every time you print 3,000 pages or load paper, you need to clean the plates and blankets. Sometimes a hard object is caught on the cloth cleaning the plate. If it is not noticed, the plate will be marked with a line of dirt. Heavy printing, wasteful work and mistakes are wasted; the use of revised pastes cannot be repaired because the dirty marks are not coated with photosensitive adhesives. Treatment: Clean the paste with a clean cloth, apply a little dampening powder, and gently wipe it on the dirty mark. When you turn on the machine, you first give the plate water and idle several times, and then you get off the ink roller. The dirty mark disappears. ;' From this we can see that do not underestimate the importance of rag cleaning.