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Q-tips, isopropyl alcohol and soft cloth + pressurized air is what you need. Disconnect from the wall outlet, open the cover. Blow the dust out with a few bursts from the air can. Clean all the upright posts along the tape path. On the left is the erase head (unless you have a fine editing VCR) - rub it clean with a q-tip soaked in alcohol - dry with a clean cloth. To the forward right of the round video head drum is the audio head, drive shaft (capstan) and rubber pinch roller. Clean all these like the erase head but use very little alcohol on the roller. Then clean the round video head. Never touch it with your fingers or anything but a q-tip or soft cloth. The actual video heads are in the tiny slots in the rotating part. Do not rub them but just touch a few times with a slightly moist (alcohol) q-tip. The rest of the drum can be rubbed normally paying attention to getting the groove clean.
DVD is a digital picture, so no amount of head cleaning will improve the picture. I think the head cleaner you have may be scam. If you can see the lens that reads the disc, you could take a Q-tip and some rubbing alcohol and gently clean it. Then dry it again with a Q-tip. If that doesn't help, then I'm afraid you may just have a bad player or TV. Try looking at your TV's settings to see if maybe the settings are off. I hope this helps!
Try cleaning the head guide shaft with alcohol and a Q-tip if you can reach it. It is the shaft that the head slides back and forth on. It will sometimes not let the head home and that is where the first track of information is that identifies the disk to the player.
The first thing you should do is check the batteries. Because the LetraTag requires heat to generate thermal printing, not ink, the batteries need to be well charged. Also, there is a small brush fitted to the inside of the lid of the cartridge cover, that is for cleaning the print head and roller. Remove it, dampen the felt tip with a little rubbing alcohol, and gently clean the print head and roller. You should find this will improve the print quality 100%
Usually the simple way to clean old ink from heads is to get a container of alcohol from the drug store and either using a Q-tip or paper towel soaked - wipe the print surface of the head to remove the old ink, then run the head clean utility once after. If you cannot reach the head surface, move the print head to change ink position, unplug the printer and fold and lay the paper towel soaked in alcohol under the head and manually move the head back and forth by hand to clean it. You may need several sheets of towel and alcohol to do this. Fold the paper thick enough so it will touch the head surface to clean.
Usually head cleaner tapes do not do much more than wear the heads out and move the dirt around or in some cases if it is an old tape it may add dirt to the system!!! Someone needs to remove the cassette cover and clean the video drum, tape path, pinch roller and capstan with denatured alcohol. Do not use anything but 100% alcohol as anything else will have contaminates in it. The video head pole pieces are extremely small (we're talking microns) and can be plugged easily. Cleaning the tape guides, audio heads, erase head, capstan and pinch roller is pretty straight forward and the same as any audio deck. Using a lint free Q-tip (or special head cleaning sticks from electronic stores) dip in alcohol and remove any dirt etc from the pieces. Cleaning the video drum is a little trickier. Using the same kind of cleaning stick dipped in alcohol, gently wipe around the video drum assembly. Never, ever go up and down across the face of the head or you could break the video heads!! If you do not know the proper way to do this you should take it to a qualified tech or you could do more damage than good. If you clean your unit the way that I described it should be fine. On occasion I have had a unit with a clogged head that requires a different technique to clean but you would not be able to do this. If cleaning does not work you will need to take it to a repair shop for service. Good luck.